21945562 has 8 divisors (see below), whose sum is σ = 32983092. Its totient is φ = 10951200.

The previous prime is 21945559. The next prime is 21945577. The reversal of 21945562 is 26554912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 1252161 = 4549^2 + 1119^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9489 + ... + 11572.

Almost surely, 2^21945562 is an apocalyptic number.

21945562 is a deficient number, since it is larger than the sum of its proper divisors (11037530).

21945562 is a wasteful number, since it uses less digits than its factorization.

21945562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21584.

The product of its digits is 21600, while the sum is 34.

The square root of 21945562 is about 4684.6090551934. The cubic root of 21945562 is about 279.9726248747.

The spelling of 21945562 in words is "twenty-one million, nine hundred forty-five thousand, five hundred sixty-two".