21230312130 has 48 divisors (see below), whose sum is σ = 58445804664. Its totient is φ = 5328391680.

The previous prime is 21230312107. The next prime is 21230312209. The reversal of 21230312130 is 3121303212.

21230312130 is a `hidden beast` number, since 212 + 303 + 121 + 30 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21214796409 + 15515721 = 145653^2 + 3939^2 .

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 23 ways as a sum of consecutive naturals, for example, 6936481 + ... + 6939540.

Almost surely, 2^21230312130 is an apocalyptic number.

21230312130 is an abundant number, since it is smaller than the sum of its proper divisors (37215492534).

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

21230312130 is a wasteful number, since it uses less digits than its factorization.

21230312130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13876051 (or 13876048 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21230312130 its reverse (3121303212), we get a palindrome (24351615342).

The spelling of 21230312130 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, one hundred thirty".