21956544 has 42 divisors (see below), whose sum is σ = 62936120. Its totient is φ = 7318656.

The previous prime is 21956527. The next prime is 21956551. The reversal of 21956544 is 44565912.

21956544 is a `hidden beast` number, since 21 + 95 + 6 + 544 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21956499 and 21956508.

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 5 ways as a sum of consecutive naturals, for example, 18484 + ... + 19635.

Almost surely, 2^21956544 is an apocalyptic number.

21956544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21956544 is an abundant number, since it is smaller than the sum of its proper divisors (40979576).

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

21956544 is a wasteful number, since it uses less digits than its factorization.

21956544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38137 (or 38124 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 21956544 is about 4685.7810448206. The cubic root of 21956544 is about 280.0193183950.

It can be divided in two parts, 21956 and 544, that added together give a square (22500 = 150²).

The spelling of 21956544 in words is "twenty-one million, nine hundred fifty-six thousand, five hundred forty-four".