21363912 has 40 divisors (see below), whose sum is σ = 59840550. Its totient is φ = 7121088.

The previous prime is 21363907. The next prime is 21363949. The reversal of 21363912 is 21936312.

21363912 is a `hidden beast` number, since 2 + 13 + 639 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 2232036 = 4374^2 + 1494^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15837 + ... + 17132.

Almost surely, 2^21363912 is an apocalyptic number.

It is an amenable number.

21363912 is an abundant number, since it is smaller than the sum of its proper divisors (38476638).

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

21363912 is a wasteful number, since it uses less digits than its factorization.

21363912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32987 (or 32974 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 21363912 is about 4622.1112059318. Note that the first 3 decimals coincide. The cubic root of 21363912 is about 277.4769593726.

The spelling of 21363912 in words is "twenty-one million, three hundred sixty-three thousand, nine hundred twelve".