21973562 has 8 divisors (see below), whose sum is σ = 35495796. Its totient is φ = 10141632.

The previous prime is 21973529. The next prime is 21973591. The reversal of 21973562 is 26537912.

It can be written as a sum of positive squares in 2 ways, for example, as 21335161 + 638401 = 4619^2 + 799^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 422543 + ... + 422594.

Almost surely, 2^21973562 is an apocalyptic number.

21973562 is a deficient number, since it is larger than the sum of its proper divisors (13522234).

21973562 is a wasteful number, since it uses less digits than its factorization.

21973562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845152.

The product of its digits is 22680, while the sum is 35.

The square root of 21973562 is about 4687.5966123377. The cubic root of 21973562 is about 280.0916451709.

The spelling of 21973562 in words is "twenty-one million, nine hundred seventy-three thousand, five hundred sixty-two".