21922452 has 72 divisors (see below), whose sum is σ = 59380776. Its totient is φ = 6795264.

The previous prime is 21922429. The next prime is 21922501. The reversal of 21922452 is 25422912.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 76176 + 21846276 = 276^2 + 4674^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68998 + ... + 69314.

It is an arithmetic number, because the mean of its divisors is an integer number (824733).

Almost surely, 2^21922452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21922452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29690388).

21922452 is an abundant number, since it is smaller than the sum of its proper divisors (37458324).

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

21922452 is a wasteful number, since it uses less digits than its factorization.

21922452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 452 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21922452 is about 4682.1418175873. The cubic root of 21922452 is about 279.8743143393.

The spelling of 21922452 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred fifty-two".