21130221010 has 16 divisors (see below), whose sum is σ = 38426506776. Its totient is φ = 8364953088.

The previous prime is 21130220987. The next prime is 21130221017. The reversal of 21130221010 is 1012203112.

It can be written as a sum of positive squares in 4 ways, for example, as 9396781969 + 11733439041 = 96937^2 + 108321^2 .

It is not an unprimeable number, because it can be changed into a prime (21130221017) 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, 10890897 + ... + 10892836.

Almost surely, 2^21130221010 is an apocalyptic number.

21130221010 is a deficient number, since it is larger than the sum of its proper divisors (17296285766).

21130221010 is a wasteful number, since it uses less digits than its factorization.

21130221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21783837.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21130221010 its reverse (1012203112), we get a palindrome (22142424122).

The spelling of 21130221010 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-one thousand, ten".