21230500066 has 16 divisors (see below), whose sum is σ = 32098701888. Its totient is φ = 10530982800.

The previous prime is 21230500033. The next prime is 21230500111. The reversal of 21230500066 is 66000503212.

It is a self number, because there is not a number n which added to its sum of digits gives 21230500066.

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, 998971 + ... + 1020001.

It is an arithmetic number, because the mean of its divisors is an integer number (2006168868).

Almost surely, 2^21230500066 is an apocalyptic number.

21230500066 is a deficient number, since it is larger than the sum of its proper divisors (10868201822).

21230500066 is a wasteful number, since it uses less digits than its factorization.

21230500066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25017.

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 21230500066 in words is "twenty-one billion, two hundred thirty million, five hundred thousand, sixty-six".