2115662521 has 48 divisors (see below), whose sum is σ = 2699308800. Its totient is φ = 1620850176.

The previous prime is 2115662503. The next prime is 2115662531. The reversal of 2115662521 is 1252665112.

It is not a de Polignac number, because 2115662521 - 2⁹ = 2115662009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115662531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5172565 + ... + 5172973.

It is an arithmetic number, because the mean of its divisors is an integer number (56235600).

Almost surely, 2^2115662521 is an apocalyptic number.

It is an amenable number.

2115662521 is a deficient number, since it is larger than the sum of its proper divisors (583646279).

2115662521 is a wasteful number, since it uses less digits than its factorization.

2115662521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 547 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 2115662521 is about 45996.3316037268. The cubic root of 2115662521 is about 1283.7549490215.

The spelling of 2115662521 in words is "two billion, one hundred fifteen million, six hundred sixty-two thousand, five hundred twenty-one".