21973446 has 24 divisors (see below), whose sum is σ = 51937704. Its totient is φ = 6658560.

The previous prime is 21973433. The next prime is 21973453. The reversal of 21973446 is 64437912.

It is a super-2 number, since 2×21973446² = 965664658229832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21973446.

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 11 ways as a sum of consecutive naturals, for example, 55291 + ... + 55686.

It is an arithmetic number, because the mean of its divisors is an integer number (2164071).

Almost surely, 2^21973446 is an apocalyptic number.

21973446 is an abundant number, since it is smaller than the sum of its proper divisors (29964258).

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

21973446 is a wasteful number, since it uses less digits than its factorization.

21973446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110996 (or 110993 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21973446 is about 4687.5842392431. The cubic root of 21973446 is about 280.0911522955.

The spelling of 21973446 in words is "twenty-one million, nine hundred seventy-three thousand, four hundred forty-six".