21926540 has 12 divisors (see below), whose sum is σ = 46045776. Its totient is φ = 8770608.

The previous prime is 21926519. The next prime is 21926561. The reversal of 21926540 is 4562912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21926519) and next prime (21926561).

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 3 ways as a sum of consecutive naturals, for example, 548144 + ... + 548183.

It is an arithmetic number, because the mean of its divisors is an integer number (3837148).

Almost surely, 2^21926540 is an apocalyptic number.

21926540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21926540 is an abundant number, since it is smaller than the sum of its proper divisors (24119236).

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

21926540 is a wasteful number, since it uses less digits than its factorization.

21926540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096336 (or 1096334 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21926540 is about 4682.5783495848. The cubic root of 21926540 is about 279.8917098248.

The spelling of 21926540 in words is "twenty-one million, nine hundred twenty-six thousand, five hundred forty".