21002031210 has 32 divisors (see below), whose sum is σ = 50418847872. Its totient is φ = 5598989120.

The previous prime is 21002031191. The next prime is 21002031221. The reversal of 21002031210 is 1213020012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15115 + ... + 205505.

It is an arithmetic number, because the mean of its divisors is an integer number (1575588996).

Almost surely, 2^21002031210 is an apocalyptic number.

21002031210 is an abundant number, since it is smaller than the sum of its proper divisors (29416816662).

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

21002031210 is a wasteful number, since it uses less digits than its factorization.

21002031210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194078.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21002031210 its reverse (1213020012), we get a palindrome (22215051222).

The spelling of 21002031210 in words is "twenty-one billion, two million, thirty-one thousand, two hundred ten".