21966972 has 24 divisors (see below), whose sum is σ = 52910592. Its totient is φ = 7086000.

The previous prime is 21966961. The next prime is 21967019. The reversal of 21966972 is 27966912.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29154 + ... + 29897.

It is an arithmetic number, because the mean of its divisors is an integer number (2204608).

Almost surely, 2^21966972 is an apocalyptic number.

It is an amenable number.

21966972 is an abundant number, since it is smaller than the sum of its proper divisors (30943620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21966972 is a wasteful number, since it uses less digits than its factorization.

21966972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59089 (or 59087 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 21966972 is about 4686.8936407817. The cubic root of 21966972 is about 280.0636419961.

The spelling of 21966972 in words is "twenty-one million, nine hundred sixty-six thousand, nine hundred seventy-two".