21122258 has 16 divisors (see below), whose sum is σ = 32323200. Its totient is φ = 10349856.

The previous prime is 21122251. The next prime is 21122267. The reversal of 21122258 is 85222112.

It is a super-2 number, since 2×21122258² = 892299566037128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28691 + ... + 29417.

It is an arithmetic number, because the mean of its divisors is an integer number (2020200).

Almost surely, 2^21122258 is an apocalyptic number.

21122258 is a deficient number, since it is larger than the sum of its proper divisors (11200942).

21122258 is a wasteful number, since it uses less digits than its factorization.

21122258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001.

The product of its digits is 640, while the sum is 23.

The square root of 21122258 is about 4595.8957777565. The cubic root of 21122258 is about 276.4267796926.

The spelling of 21122258 in words is "twenty-one million, one hundred twenty-two thousand, two hundred fifty-eight".