21974937 has 16 divisors (see below), whose sum is σ = 29816832. Its totient is φ = 14394240.

The previous prime is 21974933. The next prime is 21974941. The reversal of 21974937 is 73947912.

It is an interprime number because it is at equal distance from previous prime (21974933) and next prime (21974941).

It is not a de Polignac number, because 21974937 - 2² = 21974933 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21974933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51987 + ... + 52407.

It is an arithmetic number, because the mean of its divisors is an integer number (1863552).

Almost surely, 2^21974937 is an apocalyptic number.

It is an amenable number.

21974937 is a deficient number, since it is larger than the sum of its proper divisors (7841895).

21974937 is a wasteful number, since it uses less digits than its factorization.

21974937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

The product of its digits is 95256, while the sum is 42.

The square root of 21974937 is about 4687.7432736872. The cubic root of 21974937 is about 280.0974873125.

The spelling of 21974937 in words is "twenty-one million, nine hundred seventy-four thousand, nine hundred thirty-seven".