21021112612 has 96 divisors (see below), whose sum is σ = 42109562880. Its totient is φ = 9119900160.

The previous prime is 21021112589. The next prime is 21021112613. The reversal of 21021112612 is 21621112012.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21021112612.

It is not an unprimeable number, because it can be changed into a prime (21021112613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20388537 + ... + 20389567.

It is an arithmetic number, because the mean of its divisors is an integer number (438641280).

Almost surely, 2^21021112612 is an apocalyptic number.

It is an amenable number.

21021112612 is an abundant number, since it is smaller than the sum of its proper divisors (21088450268).

21021112612 is a wasteful number, since it uses less digits than its factorization.

21021112612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1479 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21021112612 its reverse (21621112012), we get a palindrome (42642224624).

The spelling of 21021112612 in words is "twenty-one billion, twenty-one million, one hundred twelve thousand, six hundred twelve".