21922488 has 128 divisors (see below), whose sum is σ = 70848000. Its totient is φ = 6228576.

The previous prime is 21922429. The next prime is 21922501. The reversal of 21922488 is 88422912.

It is a super-2 number, since 2×21922488² = 961190960220288, which contains 22 as substring.

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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122383 + ... + 122561.

It is an arithmetic number, because the mean of its divisors is an integer number (553500).

Almost surely, 2^21922488 is an apocalyptic number.

21922488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21922488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35424000).

21922488 is an abundant number, since it is smaller than the sum of its proper divisors (48925512).

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

21922488 is an equidigital number, since it uses as much as digits as its factorization.

21922488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 191 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 21922488 is about 4682.1456619802. The cubic root of 21922488 is about 279.8744675379.

The spelling of 21922488 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred eighty-eight".