21046756 has 24 divisors (see below), whose sum is σ = 38918880. Its totient is φ = 9931392.

The previous prime is 21046733. The next prime is 21046757. The reversal of 21046756 is 65764012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21046757) 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, 35196 + ... + 35788.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^21046756 is an apocalyptic number.

21046756 is the 2902-nd centered pentagonal number.

It is an amenable number.

21046756 is a deficient number, since it is larger than the sum of its proper divisors (17872124).

21046756 is a wasteful number, since it uses less digits than its factorization.

21046756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1081 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 21046756 is about 4587.6743563597. The cubic root of 21046756 is about 276.0970218307.

The spelling of 21046756 in words is "twenty-one million, forty-six thousand, seven hundred fifty-six".