21376812 has 24 divisors (see below), whose sum is σ = 49996800. Its totient is φ = 7108816.

The previous prime is 21376811. The next prime is 21376813. The reversal of 21376812 is 21867312.

It is an interprime number because it is at equal distance from previous prime (21376811) and next prime (21376813).

It is a self number, because there is not a number n which added to its sum of digits gives 21376812.

It is not an unprimeable number, because it can be changed into a prime (21376811) 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, 3889 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (2083200).

Almost surely, 2^21376812 is an apocalyptic number.

It is an amenable number.

21376812 is an abundant number, since it is smaller than the sum of its proper divisors (28619988).

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

21376812 is a wasteful number, since it uses less digits than its factorization.

21376812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4205 (or 4203 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 21376812 is about 4623.5064615506. The cubic root of 21376812 is about 277.5327970327.

The spelling of 21376812 in words is "twenty-one million, three hundred seventy-six thousand, eight hundred twelve".