21344258 has 16 divisors (see below), whose sum is σ = 36294720. Its totient is φ = 9332496.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344258 is 85244312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21344258.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21110 + ... + 22097.

It is an arithmetic number, because the mean of its divisors is an integer number (2268420).

Almost surely, 2^21344258 is an apocalyptic number.

21344258 is a deficient number, since it is larger than the sum of its proper divisors (14950462).

21344258 is a wasteful number, since it uses less digits than its factorization.

21344258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43241.

The product of its digits is 7680, while the sum is 29.

The square root of 21344258 is about 4619.9846320091. The cubic root of 21344258 is about 277.3918437914.

The spelling of 21344258 in words is "twenty-one million, three hundred forty-four thousand, two hundred fifty-eight".