21413258 has 8 divisors (see below), whose sum is σ = 32166720. Its totient is φ = 10691020.

The previous prime is 21413243. The next prime is 21413279. The reversal of 21413258 is 85231412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6008 + ... + 8883.

It is an arithmetic number, because the mean of its divisors is an integer number (4020840).

Almost surely, 2^21413258 is an apocalyptic number.

21413258 is a deficient number, since it is larger than the sum of its proper divisors (10753462).

21413258 is a wasteful number, since it uses less digits than its factorization.

21413258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15612.

The product of its digits is 1920, while the sum is 26.

The square root of 21413258 is about 4627.4461639224. The cubic root of 21413258 is about 277.6904322828.

The spelling of 21413258 in words is "twenty-one million, four hundred thirteen thousand, two hundred fifty-eight".