21072213227 has 8 divisors (see below), whose sum is σ = 22695413664. Its totient is φ = 19449335808.

The previous prime is 21072213193. The next prime is 21072213229. The reversal of 21072213227 is 72231227012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21072213227 - 2⁸ = 21072212971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21072213227.

It is not an unprimeable number, because it can be changed into a prime (21072213229) 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, 64418 + ... + 215160.

It is an arithmetic number, because the mean of its divisors is an integer number (2836926708).

Almost surely, 2^21072213227 is an apocalyptic number.

21072213227 is a deficient number, since it is larger than the sum of its proper divisors (1623200437).

21072213227 is a wasteful number, since it uses less digits than its factorization.

21072213227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161509.

The product of its (nonzero) digits is 4704, while the sum is 29.

The spelling of 21072213227 in words is "twenty-one billion, seventy-two million, two hundred thirteen thousand, two hundred twenty-seven".