21222885 has 16 divisors (see below), whose sum is σ = 35954496. Its totient is φ = 10652928.

The previous prime is 21222847. The next prime is 21222913. The reversal of 21222885 is 58822212.

It is not a de Polignac number, because 21222885 - 2⁷ = 21222757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41359 + ... + 41868.

It is an arithmetic number, because the mean of its divisors is an integer number (2247156).

Almost surely, 2^21222885 is an apocalyptic number.

It is an amenable number.

21222885 is a deficient number, since it is larger than the sum of its proper divisors (14731611).

21222885 is a wasteful number, since it uses less digits than its factorization.

21222885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83252.

The product of its digits is 5120, while the sum is 30.

The square root of 21222885 is about 4606.8302551755. The cubic root of 21222885 is about 276.8650526280.

The spelling of 21222885 in words is "twenty-one million, two hundred twenty-two thousand, eight hundred eighty-five".