21922992 has 180 divisors, whose sum is σ = 77182560. Its totient is φ = 5757696.

The previous prime is 21922969. The next prime is 21922993. The reversal of 21922992 is 29922912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21922993) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 91609 + ... + 91847.

It is an arithmetic number, because the mean of its divisors is an integer number (428792).

Almost surely, 2^21922992 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 21922992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38591280).

21922992 is an abundant number, since it is smaller than the sum of its proper divisors (55259568).

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

21922992 is a wasteful number, since it uses less digits than its factorization.

21922992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 264 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 21922992 is about 4682.1994831489. The cubic root of 21922992 is about 279.8766123014.

It can be divided in two parts, 2192 and 2992, that added together give a square (5184 = 72²).

The spelling of 21922992 in words is "twenty-one million, nine hundred twenty-two thousand, nine hundred ninety-two".