21368258 has 8 divisors (see below), whose sum is σ = 32305152. Its totient is φ = 10599876.

The previous prime is 21368233. The next prime is 21368261. The reversal of 21368258 is 85286312.

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, 41810 + ... + 42317.

It is an arithmetic number, because the mean of its divisors is an integer number (4038144).

Almost surely, 2^21368258 is an apocalyptic number.

21368258 is a deficient number, since it is larger than the sum of its proper divisors (10936894).

21368258 is a wasteful number, since it uses less digits than its factorization.

21368258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84256.

The product of its digits is 23040, while the sum is 35.

The square root of 21368258 is about 4622.5813135087. The cubic root of 21368258 is about 277.4957735471.

The spelling of 21368258 in words is "twenty-one million, three hundred sixty-eight thousand, two hundred fifty-eight".