15213453612 has 72 divisors (see below), whose sum is σ = 43096080384. Its totient is φ = 4091006208.

The previous prime is 15213453589. The next prime is 15213453631. The reversal of 15213453612 is 21635431251.

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, 289068 + ... + 337619.

It is an arithmetic number, because the mean of its divisors is an integer number (598556672).

Almost surely, 2^15213453612 is an apocalyptic number.

15213453612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15213453612 is an abundant number, since it is smaller than the sum of its proper divisors (27882626772).

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

15213453612 is a wasteful number, since it uses less digits than its factorization.

15213453612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626735 (or 626716 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

Adding to 15213453612 its reverse (21635431251), we get a palindrome (36848884863).

The spelling of 15213453612 in words is "fifteen billion, two hundred thirteen million, four hundred fifty-three thousand, six hundred twelve".