21268258 has 64 divisors (see below), whose sum is σ = 40279680. Its totient is φ = 8294400.

The previous prime is 21268253. The next prime is 21268259. The reversal of 21268258 is 85286212.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (21268253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291310 + ... + 291382.

It is an arithmetic number, because the mean of its divisors is an integer number (629370).

Almost surely, 2^21268258 is an apocalyptic number.

21268258 is a deficient number, since it is larger than the sum of its proper divisors (19011422).

21268258 is a wasteful number, since it uses less digits than its factorization.

21268258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163.

The product of its digits is 15360, while the sum is 34.

The square root of 21268258 is about 4611.7521615976. The cubic root of 21268258 is about 277.0622180353.

The spelling of 21268258 in words is "twenty-one million, two hundred sixty-eight thousand, two hundred fifty-eight".