21463956 has 36 divisors (see below), whose sum is σ = 54486432. Its totient is φ = 7124304.

The previous prime is 21463943. The next prime is 21463961. The reversal of 21463956 is 65936412.

It is a happy number.

21463956 is a `hidden beast` number, since 2 + 14 + 639 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21463956.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8335 + ... + 10601.

It is an arithmetic number, because the mean of its divisors is an integer number (1513512).

Almost surely, 2^21463956 is an apocalyptic number.

It is an amenable number.

21463956 is an abundant number, since it is smaller than the sum of its proper divisors (33022476).

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

21463956 is a wasteful number, since it uses less digits than its factorization.

21463956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540 (or 2535 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21463956 is about 4632.9208929141. The cubic root of 21463956 is about 277.9094127154.

The spelling of 21463956 in words is "twenty-one million, four hundred sixty-three thousand, nine hundred fifty-six".