21313112130 has 96 divisors (see below), whose sum is σ = 56222365680. Its totient is φ = 5601024000.

The previous prime is 21313112099. The next prime is 21313112147. The reversal of 21313112130 is 3121131312.

It can be written as a sum of positive squares in 8 ways, for example, as 54597321 + 21258514809 = 7389^2 + 145803^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2502880 + ... + 2511380.

Almost surely, 2^21313112130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313112130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28111182840).

21313112130 is an abundant number, since it is smaller than the sum of its proper divisors (34909253550).

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

21313112130 is a wasteful number, since it uses less digits than its factorization.

21313112130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8916 (or 8913 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21313112130 its reverse (3121131312), we get a palindrome (24434243442).

The spelling of 21313112130 in words is "twenty-one billion, three hundred thirteen million, one hundred twelve thousand, one hundred thirty".