21521268002 has 16 divisors (see below), whose sum is σ = 34774978560. Its totient is φ = 9930077712.

The previous prime is 21521268001. The next prime is 21521268029. The reversal of 21521268002 is 20086212512.

It is not an unprimeable number, because it can be changed into a prime (21521268001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22352 + ... + 208667.

It is an arithmetic number, because the mean of its divisors is an integer number (2173436160).

Almost surely, 2^21521268002 is an apocalyptic number.

21521268002 is a deficient number, since it is larger than the sum of its proper divisors (13253710558).

21521268002 is a wasteful number, since it uses less digits than its factorization.

21521268002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234617.

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 21521268002 in words is "twenty-one billion, five hundred twenty-one million, two hundred sixty-eight thousand, two".