21521102116 has 12 divisors (see below), whose sum is σ = 39299404032. Its totient is φ = 10292700968.

The previous prime is 21521102107. The next prime is 21521102149. The reversal of 21521102116 is 61120112512.

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, 116962420 + ... + 116962603.

It is an arithmetic number, because the mean of its divisors is an integer number (3274950336).

Almost surely, 2^21521102116 is an apocalyptic number.

It is an amenable number.

21521102116 is a deficient number, since it is larger than the sum of its proper divisors (17778301916).

21521102116 is a wasteful number, since it uses less digits than its factorization.

21521102116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233925050 (or 233925048 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 21521102116 its reverse (61120112512), we get a palindrome (82641214628).

The spelling of 21521102116 in words is "twenty-one billion, five hundred twenty-one million, one hundred two thousand, one hundred sixteen".