21130512 has 40 divisors (see below), whose sum is σ = 58787904. Its totient is φ = 6501504.

The previous prime is 21130511. The next prime is 21130573. The reversal of 21130512 is 21503112.

It is a junction number, because it is equal to n+sod(n) for n = 21130491 and 21130500.

It is not an unprimeable number, because it can be changed into a prime (21130511) 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, 16308 + ... + 17555.

Almost surely, 2^21130512 is an apocalyptic number.

It is an amenable number.

21130512 is an abundant number, since it is smaller than the sum of its proper divisors (37657392).

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

21130512 is a wasteful number, since it uses less digits than its factorization.

21130512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33887 (or 33881 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21130512 is about 4596.7936651540. The cubic root of 21130512 is about 276.4627816754.

Adding to 21130512 its reverse (21503112), we get a palindrome (42633624).

The spelling of 21130512 in words is "twenty-one million, one hundred thirty thousand, five hundred twelve".