2121251040 has 72 divisors (see below), whose sum is σ = 7238774088. Its totient is φ = 565666560.

The previous prime is 2121250997. The next prime is 2121251053. The reversal of 2121251040 is 401521212.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 735106 + ... + 737985.

It is an arithmetic number, because the mean of its divisors is an integer number (100538529).

Almost surely, 2^2121251040 is an apocalyptic number.

2121251040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121251040 is an abundant number, since it is smaller than the sum of its proper divisors (5117523048).

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

2121251040 is a wasteful number, since it uses less digits than its factorization.

2121251040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473112 (or 1473101 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2121251040 is about 46057.0411555063. The cubic root of 2121251040 is about 1284.8843007257.

Adding to 2121251040 its reverse (401521212), we get a palindrome (2522772252).

The spelling of 2121251040 in words is "two billion, one hundred twenty-one million, two hundred fifty-one thousand, forty".