21622456 has 24 divisors (see below), whose sum is σ = 42793920. Its totient is φ = 10240848.

The previous prime is 21622427. The next prime is 21622459. The reversal of 21622456 is 65422612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 856 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (1783080).

Almost surely, 2^21622456 is an apocalyptic number.

It is an amenable number.

21622456 is a deficient number, since it is larger than the sum of its proper divisors (21171464).

21622456 is a wasteful number, since it uses less digits than its factorization.

21622456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7531 (or 7508 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21622456 is about 4649.9952688148. The cubic root of 21622456 is about 278.5918072566.

The spelling of 21622456 in words is "twenty-one million, six hundred twenty-two thousand, four hundred fifty-six".