221396539923 has 32 divisors (see below), whose sum is σ = 358497305600. Its totient is φ = 134210517408.

The previous prime is 221396539813. The next prime is 221396539927. The reversal of 221396539923 is 329935693122.

221396539923 is a `hidden beast` number, since 2 + 2 + 13 + 9 + 6 + 539 + 92 + 3 = 666.

It is not a de Polignac number, because 221396539923 - 2²⁵ = 221362985491 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 221396539923.

It is not an unprimeable number, because it can be changed into a prime (221396539927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4683643 + ... + 4730676.

It is an arithmetic number, because the mean of its divisors is an integer number (11203040800).

Almost surely, 2^221396539923 is an apocalyptic number.

221396539923 is a deficient number, since it is larger than the sum of its proper divisors (137100765677).

221396539923 is a wasteful number, since it uses less digits than its factorization.

221396539923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414408 (or 9414402 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 54.

The spelling of 221396539923 in words is "two hundred twenty-one billion, three hundred ninety-six million, five hundred thirty-nine thousand, nine hundred twenty-three".