21012031130 has 32 divisors (see below), whose sum is σ = 38120864976. Its totient is φ = 8338397184.

The previous prime is 21012031129. The next prime is 21012031177. The reversal of 21012031130 is 3113021012.

It can be written as a sum of positive squares in 8 ways, for example, as 9458146009 + 11553885121 = 97253^2 + 107489^2 .

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, 2924102 + ... + 2931278.

Almost surely, 2^21012031130 is an apocalyptic number.

21012031130 is a deficient number, since it is larger than the sum of its proper divisors (17108833846).

21012031130 is a wasteful number, since it uses less digits than its factorization.

21012031130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21012031130 its reverse (3113021012), we get a palindrome (24125052142).

The spelling of 21012031130 in words is "twenty-one billion, twelve million, thirty-one thousand, one hundred thirty".