21937080 has 64 divisors (see below), whose sum is σ = 71798400. Its totient is φ = 5317760.

The previous prime is 21937067. The next prime is 21937081. The reversal of 21937080 is 8073912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21937081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6990 + ... + 9629.

It is an arithmetic number, because the mean of its divisors is an integer number (1121850).

Almost surely, 2^21937080 is an apocalyptic number.

21937080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21937080 is an abundant number, since it is smaller than the sum of its proper divisors (49861320).

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

21937080 is a wasteful number, since it uses less digits than its factorization.

21937080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16644 (or 16640 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21937080 is about 4683.7036627011. The cubic root of 21937080 is about 279.9365502488.

The spelling of 21937080 in words is "twenty-one million, nine hundred thirty-seven thousand, eighty".