21706892 has 48 divisors (see below), whose sum is σ = 43273440. Its totient is φ = 9464832.

The previous prime is 21706891. The next prime is 21706897. The reversal of 21706892 is 29860712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21706891) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 68318 + ... + 68634.

It is an arithmetic number, because the mean of its divisors is an integer number (901530).

Almost surely, 2^21706892 is an apocalyptic number.

It is an amenable number.

21706892 is a deficient number, since it is larger than the sum of its proper divisors (21566548).

21706892 is a wasteful number, since it uses less digits than its factorization.

21706892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 21706892 is about 4659.0655715497. The cubic root of 21706892 is about 278.9539712439.

The spelling of 21706892 in words is "twenty-one million, seven hundred six thousand, eight hundred ninety-two".