21965974 has 8 divisors (see below), whose sum is σ = 32978160. Its totient is φ = 10973256.

The previous prime is 21965971. The next prime is 21965981. The reversal of 21965974 is 47956912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21965974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21965971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1609 + ... + 6820.

It is an arithmetic number, because the mean of its divisors is an integer number (4122270).

Almost surely, 2^21965974 is an apocalyptic number.

21965974 is a deficient number, since it is larger than the sum of its proper divisors (11012186).

21965974 is a wasteful number, since it uses less digits than its factorization.

21965974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9734.

The product of its digits is 136080, while the sum is 43.

The square root of 21965974 is about 4686.7871724669. The cubic root of 21965974 is about 280.0594006628.

The spelling of 21965974 in words is "twenty-one million, nine hundred sixty-five thousand, nine hundred seventy-four".