21116974 has 4 divisors (see below), whose sum is σ = 31675464. Its totient is φ = 10558486.

The previous prime is 21116969. The next prime is 21116987. The reversal of 21116974 is 47961112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5279242 + ... + 5279245.

It is an arithmetic number, because the mean of its divisors is an integer number (7918866).

Almost surely, 2^21116974 is an apocalyptic number.

21116974 is a deficient number, since it is larger than the sum of its proper divisors (10558490).

21116974 is a wasteful number, since it uses less digits than its factorization.

21116974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558489.

The product of its digits is 3024, while the sum is 31.

The square root of 21116974 is about 4595.3208810702. The cubic root of 21116974 is about 276.4037272185.

The spelling of 21116974 in words is "twenty-one million, one hundred sixteen thousand, nine hundred seventy-four".