21120660623206 has 16 divisors (see below), whose sum is σ = 31834833650928. Its totient is φ = 10509172236000.

The previous prime is 21120660623197. The next prime is 21120660623213. The reversal of 21120660623206 is 60232606602112.

It is a congruent number.

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, 30363120 + ... + 31050931.

It is an arithmetic number, because the mean of its divisors is an integer number (1989677103183).

Almost surely, 2^{21120660623206} is an apocalyptic number.

21120660623206 is a deficient number, since it is larger than the sum of its proper divisors (10714173027722).

21120660623206 is a wasteful number, since it uses less digits than its factorization.

21120660623206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61414887.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21120660623206 in words is "twenty-one trillion, one hundred twenty billion, six hundred sixty million, six hundred twenty-three thousand, two hundred six".