21668746227 has 8 divisors (see below), whose sum is σ = 30591171216. Its totient is φ = 13596076032.

The previous prime is 21668746217. The next prime is 21668746243. The reversal of 21668746227 is 72264786612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21668746227 - 2⁶ = 21668746163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 424877377 = 21668746227 / (2 + 1 + 6 + 6 + 8 + 7 + 4 + 6 + 2 + 2 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 21668746227.

It is not an unprimeable number, because it can be changed into a prime (21668746217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212438638 + ... + 212438739.

It is an arithmetic number, because the mean of its divisors is an integer number (3823896402).

Almost surely, 2^21668746227 is an apocalyptic number.

21668746227 is a deficient number, since it is larger than the sum of its proper divisors (8922424989).

21668746227 is a wasteful number, since it uses less digits than its factorization.

21668746227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424877397.

The product of its digits is 2709504, while the sum is 51.

The spelling of 21668746227 in words is "twenty-one billion, six hundred sixty-eight million, seven hundred forty-six thousand, two hundred twenty-seven".