21120000312 has 32 divisors (see below), whose sum is σ = 52806758400. Its totient is φ = 7039099104.

The previous prime is 21120000311. The next prime is 21120000331. The reversal of 21120000312 is 21300002112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120000311) 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 7 ways as a sum of consecutive naturals, for example, 150639 + ... + 254817.

It is an arithmetic number, because the mean of its divisors is an integer number (1650211200).

Almost surely, 2^21120000312 is an apocalyptic number.

It is an amenable number.

21120000312 is an abundant number, since it is smaller than the sum of its proper divisors (31686758088).

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

21120000312 is a wasteful number, since it uses less digits than its factorization.

21120000312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112635 (or 112631 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21120000312 its reverse (21300002112), we get a palindrome (42420002424).

The spelling of 21120000312 in words is "twenty-one billion, one hundred twenty million, three hundred twelve", and thus it is an aban number.