21321031002 has 16 divisors (see below), whose sum is σ = 42697522560. Its totient is φ = 7097766912.

The previous prime is 21321030989. The next prime is 21321031019. The reversal of 21321031002 is 20013012312.

21321031002 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 2305858 + ... + 2315085.

It is an arithmetic number, because the mean of its divisors is an integer number (2668595160).

Almost surely, 2^21321031002 is an apocalyptic number.

21321031002 is an abundant number, since it is smaller than the sum of its proper divisors (21376491558).

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

21321031002 is a wasteful number, since it uses less digits than its factorization.

21321031002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4621717.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21321031002 its reverse (20013012312), we get a palindrome (41334043314).

The spelling of 21321031002 in words is "twenty-one billion, three hundred twenty-one million, thirty-one thousand, two".