21311113130 has 32 divisors (see below), whose sum is σ = 42017052240. Its totient is φ = 7746350080.

The previous prime is 21311113093. The next prime is 21311113157. The reversal of 21311113130 is 3131111312.

It can be written as a sum of positive squares in 8 ways, for example, as 11492483209 + 9818629921 = 107203^2 + 99089^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21311113099 and 21311113108.

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, 2156441 + ... + 2166300.

Almost surely, 2^21311113130 is an apocalyptic number.

21311113130 is a deficient number, since it is larger than the sum of its proper divisors (20705939110).

21311113130 is a wasteful number, since it uses less digits than its factorization.

21311113130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322794.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21311113130 its reverse (3131111312), we get a palindrome (24442224442).

The spelling of 21311113130 in words is "twenty-one billion, three hundred eleven million, one hundred thirteen thousand, one hundred thirty".