21070258 has 16 divisors (see below), whose sum is σ = 35282016. Its totient is φ = 9354240.

The previous prime is 21070237. The next prime is 21070267. The reversal of 21070258 is 85207012.

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, 10191 + ... + 12082.

It is an arithmetic number, because the mean of its divisors is an integer number (2205126).

Almost surely, 2^21070258 is an apocalyptic number.

21070258 is a deficient number, since it is larger than the sum of its proper divisors (14211758).

21070258 is a wasteful number, since it uses less digits than its factorization.

21070258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22329.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 21070258 is about 4590.2350702333. The cubic root of 21070258 is about 276.1997521270.

The spelling of 21070258 in words is "twenty-one million, seventy thousand, two hundred fifty-eight".