21934140 has 24 divisors (see below), whose sum is σ = 61415760. Its totient is φ = 5849088.

The previous prime is 21934127. The next prime is 21934169. The reversal of 21934140 is 4143912.

It is a super-2 number, since 2×21934140² = 962212995079200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21934140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182725 + ... + 182844.

It is an arithmetic number, because the mean of its divisors is an integer number (2558990).

Almost surely, 2^21934140 is an apocalyptic number.

21934140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21934140 is an abundant number, since it is smaller than the sum of its proper divisors (39481620).

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

21934140 is a wasteful number, since it uses less digits than its factorization.

21934140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365581 (or 365579 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21934140 is about 4683.3897979989. The cubic root of 21934140 is about 279.9240440230.

The spelling of 21934140 in words is "twenty-one million, nine hundred thirty-four thousand, one hundred forty".