21170974 has 16 divisors (see below), whose sum is σ = 34784640. Its totient is φ = 9583960.

The previous prime is 21170969. The next prime is 21170983. The reversal of 21170974 is 47907112.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3957 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (2174040).

Almost surely, 2^21170974 is an apocalyptic number.

21170974 is a deficient number, since it is larger than the sum of its proper divisors (13613666).

21170974 is a wasteful number, since it uses less digits than its factorization.

21170974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 21170974 is about 4601.1926714712. The cubic root of 21170974 is about 276.6391317898.

The spelling of 21170974 in words is "twenty-one million, one hundred seventy thousand, nine hundred seventy-four".