21932120 has 128 divisors (see below), whose sum is σ = 60739200. Its totient is φ = 6967296.

The previous prime is 21932077. The next prime is 21932143. The reversal of 21932120 is 2123912.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21932092 and 21932101.

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, 300404 + ... + 300476.

It is an arithmetic number, because the mean of its divisors is an integer number (474525).

Almost surely, 2^21932120 is an apocalyptic number.

21932120 is a gapful number since it is divisible by the number (20) 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 21932120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30369600).

21932120 is an abundant number, since it is smaller than the sum of its proper divisors (38807080).

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

21932120 is a wasteful number, since it uses less digits than its factorization.

21932120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21932120 is about 4683.1741372706. The cubic root of 21932120 is about 279.9154506624.

The spelling of 21932120 in words is "twenty-one million, nine hundred thirty-two thousand, one hundred twenty".