21166307974 has 32 divisors (see below), whose sum is σ = 37239354432. Its totient is φ = 8833536000.

The previous prime is 21166307947. The next prime is 21166307989. The reversal of 21166307974 is 47970366112.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276454 + ... + 344614.

It is an arithmetic number, because the mean of its divisors is an integer number (1163729826).

Almost surely, 2^21166307974 is an apocalyptic number.

21166307974 is a deficient number, since it is larger than the sum of its proper divisors (16073046458).

21166307974 is a wasteful number, since it uses less digits than its factorization.

21166307974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68752.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 21166307974 in words is "twenty-one billion, one hundred sixty-six million, three hundred seven thousand, nine hundred seventy-four".