226644731721 has 8 divisors (see below), whose sum is σ = 335769972960. Its totient is φ = 151096487796.

The previous prime is 226644731711. The next prime is 226644731723. The reversal of 226644731721 is 127137446622.

226644731721 is a `hidden beast` number, since 2 + 2 + 6 + 6 + 4 + 473 + 172 + 1 = 666.

It is not a de Polignac number, because 226644731721 - 2¹¹ = 226644729673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (226644731723) 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, 4197124635 + ... + 4197124688.

It is an arithmetic number, because the mean of its divisors is an integer number (41971246620).

Almost surely, 2^226644731721 is an apocalyptic number.

It is an amenable number.

226644731721 is a deficient number, since it is larger than the sum of its proper divisors (109125241239).

226644731721 is an equidigital number, since it uses as much as digits as its factorization.

226644731721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8394249332 (or 8394249326 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The spelling of 226644731721 in words is "two hundred twenty-six billion, six hundred forty-four million, seven hundred thirty-one thousand, seven hundred twenty-one".