21017615496 has 16 divisors (see below), whose sum is σ = 52544038800. Its totient is φ = 7005871824.

The previous prime is 21017615477. The next prime is 21017615537. The reversal of 21017615496 is 69451671012.

It is a super-2 number, since 2×21017615496² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437866966 + ... + 437867013.

It is an arithmetic number, because the mean of its divisors is an integer number (3284002425).

Almost surely, 2^21017615496 is an apocalyptic number.

It is an amenable number.

21017615496 is an abundant number, since it is smaller than the sum of its proper divisors (31526423304).

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

21017615496 is a wasteful number, since it uses less digits than its factorization.

21017615496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875733988 (or 875733984 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 21017615496 in words is "twenty-one billion, seventeen million, six hundred fifteen thousand, four hundred ninety-six".