2125521240 has 128 divisors (see below), whose sum is σ = 6569026560. Its totient is φ = 549794304.

The previous prime is 2125521227. The next prime is 2125521247. The reversal of 2125521240 is 421255212.

2125521240 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2125521240² = 9035681083382275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2125521240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125521247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2161789 + ... + 2162771.

It is an arithmetic number, because the mean of its divisors is an integer number (51320520).

Almost surely, 2^2125521240 is an apocalyptic number.

2125521240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2125521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3284513280).

2125521240 is an abundant number, since it is smaller than the sum of its proper divisors (4443505320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2125521240 is a wasteful number, since it uses less digits than its factorization.

2125521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1517 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 2125521240 is about 46103.3755814040. The cubic root of 2125521240 is about 1285.7459047603.

Adding to 2125521240 its reverse (421255212), we get a palindrome (2546776452).

The spelling of 2125521240 in words is "two billion, one hundred twenty-five million, five hundred twenty-one thousand, two hundred forty".