21374756 has 24 divisors (see below), whose sum is σ = 40971840. Its totient is φ = 9696672.

The previous prime is 21374747. The next prime is 21374761. The reversal of 21374756 is 65747312.

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, 416 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (1707160).

Almost surely, 2^21374756 is an apocalyptic number.

21374756 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21374756 is a deficient number, since it is larger than the sum of its proper divisors (19597084).

21374756 is a wasteful number, since it uses less digits than its factorization.

21374756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043 (or 7041 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The square root of 21374756 is about 4623.2841141336. The cubic root of 21374756 is about 277.5238991402.

The spelling of 21374756 in words is "twenty-one million, three hundred seventy-four thousand, seven hundred fifty-six".