21130023130 has 16 divisors (see below), whose sum is σ = 38426146920. Its totient is φ = 8364874752.

The previous prime is 21130023127. The next prime is 21130023133. The reversal of 21130023130 is 3132003112.

It is an interprime number because it is at equal distance from previous prime (21130023127) and next prime (21130023133).

It can be written as a sum of positive squares in 4 ways, for example, as 20175645681 + 954377449 = 142041^2 + 30893^2 .

It is not an unprimeable number, because it can be changed into a prime (21130023133) 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, 10890795 + ... + 10892734.

Almost surely, 2^21130023130 is an apocalyptic number.

21130023130 is a deficient number, since it is larger than the sum of its proper divisors (17296123790).

21130023130 is a wasteful number, since it uses less digits than its factorization.

21130023130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21783633.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21130023130 its reverse (3132003112), we get a palindrome (24262026242).

The spelling of 21130023130 in words is "twenty-one billion, one hundred thirty million, twenty-three thousand, one hundred thirty".