21356056 has 8 divisors (see below), whose sum is σ = 40042620. Its totient is φ = 10678024.

The previous prime is 21356051. The next prime is 21356089. The reversal of 21356056 is 65065312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×21356056³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334746 + ... + 1334761.

Almost surely, 2^21356056 is an apocalyptic number.

It is an amenable number.

21356056 is a deficient number, since it is larger than the sum of its proper divisors (18686564).

21356056 is a wasteful number, since it uses less digits than its factorization.

21356056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669513 (or 2669509 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 21356056 is about 4621.2612996886. The cubic root of 21356056 is about 277.4429436574.

The spelling of 21356056 in words is "twenty-one million, three hundred fifty-six thousand, fifty-six".