21431876112 has 60 divisors (see below), whose sum is σ = 60801153244. Its totient is φ = 7046092800.

The previous prime is 21431876111. The next prime is 21431876117. The reversal of 21431876112 is 21167813412.

21431876112 is a `hidden beast` number, since 2 + 1 + 4 + 31 + 8 + 7 + 611 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17668789776 + 3763086336 = 132924^2 + 61344^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21431876111) 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 11 ways as a sum of consecutive naturals, for example, 1008889 + ... + 1029912.

Almost surely, 2^21431876112 is an apocalyptic number.

It is an amenable number.

21431876112 is an abundant number, since it is smaller than the sum of its proper divisors (39369277132).

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

21431876112 is a wasteful number, since it uses less digits than its factorization.

21431876112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038888 (or 2038879 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The spelling of 21431876112 in words is "twenty-one billion, four hundred thirty-one million, eight hundred seventy-six thousand, one hundred twelve".