21739368 has 32 divisors (see below), whose sum is σ = 62112960. Its totient is φ = 6211200.

The previous prime is 21739351. The next prime is 21739369. The reversal of 21739368 is 86393712.

It is not an unprimeable number, because it can be changed into a prime (21739369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64533 + ... + 64868.

It is an arithmetic number, because the mean of its divisors is an integer number (1941030).

Almost surely, 2^21739368 is an apocalyptic number.

21739368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21739368 is an abundant number, since it is smaller than the sum of its proper divisors (40373592).

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

21739368 is a wasteful number, since it uses less digits than its factorization.

21739368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129417 (or 129413 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 21739368 is about 4662.5495171633. The cubic root of 21739368 is about 279.0930176352.

The spelling of 21739368 in words is "twenty-one million, seven hundred thirty-nine thousand, three hundred sixty-eight".