221773405301331 has 16 divisors (see below), whose sum is σ = 323196757519104. Its totient is φ = 134438987368224.

The previous prime is 221773405301323. The next prime is 221773405301333. The reversal of 221773405301331 is 133103504377122.

It is not a de Polignac number, because 221773405301331 - 2³ = 221773405301323 is a prime.

It is a super-2 number, since 2×221773405301331² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221773405301333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42436546431 + ... + 42436551656.

It is an arithmetic number, because the mean of its divisors is an integer number (20199797344944).

Almost surely, 2^{221773405301331} is an apocalyptic number.

221773405301331 is a deficient number, since it is larger than the sum of its proper divisors (101423352217773).

221773405301331 is a wasteful number, since it uses less digits than its factorization.

221773405301331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84873098170.

The product of its (nonzero) digits is 317520, while the sum is 42.

Adding to 221773405301331 its reverse (133103504377122), we get a palindrome (354876909678453).

The spelling of 221773405301331 in words is "two hundred twenty-one trillion, seven hundred seventy-three billion, four hundred five million, three hundred one thousand, three hundred thirty-one".