21722754 has 16 divisors (see below), whose sum is σ = 44847360. Its totient is φ = 7007280.

The previous prime is 21722749. The next prime is 21722759. The reversal of 21722754 is 45722712.

It is an interprime number because it is at equal distance from previous prime (21722749) and next prime (21722759).

It is not an unprimeable number, because it can be changed into a prime (21722759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58209 + ... + 58580.

It is an arithmetic number, because the mean of its divisors is an integer number (2802960).

Almost surely, 2^21722754 is an apocalyptic number.

21722754 is an abundant number, since it is smaller than the sum of its proper divisors (23124606).

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

21722754 is a wasteful number, since it uses less digits than its factorization.

21722754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116825.

The product of its digits is 7840, while the sum is 30.

The square root of 21722754 is about 4660.7675333576. The cubic root of 21722754 is about 279.0219019047.

The spelling of 21722754 in words is "twenty-one million, seven hundred twenty-two thousand, seven hundred fifty-four".