21066125210 has 64 divisors (see below), whose sum is σ = 41765068800. Its totient is φ = 7601755392.

The previous prime is 21066125191. The next prime is 21066125221. The reversal of 21066125210 is 1252166012.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 21066125210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5063111 + ... + 5067269.

It is an arithmetic number, because the mean of its divisors is an integer number (652579200).

Almost surely, 2^21066125210 is an apocalyptic number.

21066125210 is a deficient number, since it is larger than the sum of its proper divisors (20698943590).

21066125210 is a wasteful number, since it uses less digits than its factorization.

21066125210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 21066125210 in words is "twenty-one billion, sixty-six million, one hundred twenty-five thousand, two hundred ten".