21222592 has 14 divisors (see below), whose sum is σ = 42113708. Its totient is φ = 10611264.

The previous prime is 21222587. The next prime is 21222611. The reversal of 21222592 is 29522212.

It is a super-2 number, since 2×21222592² = 900796822396928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165738 + ... + 165865.

It is an arithmetic number, because the mean of its divisors is an integer number (3008122).

Almost surely, 2^21222592 is an apocalyptic number.

It is an amenable number.

21222592 is a deficient number, since it is larger than the sum of its proper divisors (20891116).

21222592 is an equidigital number, since it uses as much as digits as its factorization.

21222592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331615 (or 331605 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 21222592 is about 4606.7984544584. The cubic root of 21222592 is about 276.8637785029.

The spelling of 21222592 in words is "twenty-one million, two hundred twenty-two thousand, five hundred ninety-two".