2121252240 has 40 divisors (see below), whose sum is σ = 6575882688. Its totient is φ = 565667200.

The previous prime is 2121252239. The next prime is 2121252251. The reversal of 2121252240 is 422521212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×2121252240² = 8999422131410035200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4419036 + ... + 4419515.

Almost surely, 2^2121252240 is an apocalyptic number.

2121252240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121252240 is an abundant number, since it is smaller than the sum of its proper divisors (4454630448).

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

2121252240 is a wasteful number, since it uses less digits than its factorization.

2121252240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8838567 (or 8838561 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2121252240 is about 46057.0541828285. The cubic root of 2121252240 is about 1284.8845430137.

Adding to 2121252240 its reverse (422521212), we get a palindrome (2543773452).

The spelling of 2121252240 in words is "two billion, one hundred twenty-one million, two hundred fifty-two thousand, two hundred forty".