226155057721 has 4 divisors (see below), whose sum is σ = 231414477712. Its totient is φ = 220895637732.

The previous prime is 226155057707. The next prime is 226155057757. The reversal of 226155057721 is 127750551622.

226155057721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127750551622 = 2 ⋅63875275811.

It is a cyclic number.

It is not a de Polignac number, because 226155057721 - 2²³ = 226146669113 is a prime.

It is a super-2 number, since 2×226155057721² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 5259419947 = 226155057721 / (2 + 2 + 6 + 1 + 5 + 5 + 0 + 5 + 7 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (226155058721) 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 3 ways as a sum of consecutive naturals, for example, 2629709931 + ... + 2629710016.

It is an arithmetic number, because the mean of its divisors is an integer number (57853619428).

Almost surely, 2^226155057721 is an apocalyptic number.

It is an amenable number.

226155057721 is a deficient number, since it is larger than the sum of its proper divisors (5259419991).

226155057721 is an equidigital number, since it uses as much as digits as its factorization.

226155057721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5259419990.

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 226155057721 in words is "two hundred twenty-six billion, one hundred fifty-five million, fifty-seven thousand, seven hundred twenty-one".