21722532 has 48 divisors (see below), whose sum is σ = 57802752. Its totient is φ = 6289920.

The previous prime is 21722531. The next prime is 21722543. The reversal of 21722532 is 23522712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444 + ... + 6747.

It is an arithmetic number, because the mean of its divisors is an integer number (1204224).

Almost surely, 2^21722532 is an apocalyptic number.

It is an amenable number.

21722532 is an abundant number, since it is smaller than the sum of its proper divisors (36080220).

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

21722532 is a wasteful number, since it uses less digits than its factorization.

21722532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8228 (or 8226 counting only the distinct ones).

The product of its digits is 1680, while the sum is 24.

The square root of 21722532 is about 4660.7437174769. The cubic root of 21722532 is about 279.0209513949.

The spelling of 21722532 in words is "twenty-one million, seven hundred twenty-two thousand, five hundred thirty-two".