21622056 has 32 divisors (see below), whose sum is σ = 54820800. Its totient is φ = 7105280.

The previous prime is 21622037. The next prime is 21622061. The reversal of 21622056 is 65022612.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4641 + ... + 8048.

It is an arithmetic number, because the mean of its divisors is an integer number (1713150).

Almost surely, 2^21622056 is an apocalyptic number.

It is an amenable number.

21622056 is an abundant number, since it is smaller than the sum of its proper divisors (33198744).

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

21622056 is a wasteful number, since it uses less digits than its factorization.

21622056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12769 (or 12765 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21622056 is about 4649.9522578194. The cubic root of 21622056 is about 278.5900893294.

Adding to 21622056 its reverse (65022612), we get a palindrome (86644668).

The spelling of 21622056 in words is "twenty-one million, six hundred twenty-two thousand, fifty-six".