221873735621 has 24 divisors (see below), whose sum is σ = 239225992320. Its totient is φ = 205704225792.

The previous prime is 221873735609. The next prime is 221873735623. The reversal of 221873735621 is 126537378122.

221873735621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221873735621 - 2³⁴ = 204693866437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221873735623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10103165 + ... + 10125101.

It is an arithmetic number, because the mean of its divisors is an integer number (9967749680).

Almost surely, 2^221873735621 is an apocalyptic number.

It is an amenable number.

221873735621 is a deficient number, since it is larger than the sum of its proper divisors (17352256699).

221873735621 is a wasteful number, since it uses less digits than its factorization.

221873735621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22493 (or 22476 counting only the distinct ones).

The product of its digits is 846720, while the sum is 47.

The spelling of 221873735621 in words is "two hundred twenty-one billion, eight hundred seventy-three million, seven hundred thirty-five thousand, six hundred twenty-one".