221807413081 has 4 divisors (see below), whose sum is σ = 222286479232. Its totient is φ = 221328346932.

The previous prime is 221807412997. The next prime is 221807413097. The reversal of 221807413081 is 180314708122.

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.

It is a cyclic number.

It is not a de Polignac number, because 221807413081 - 2²⁹ = 221270542169 is a prime.

It is a super-2 number, since 2×221807413081² (a number of 23 digits) contains 22 as substring.

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 221807413081.

It is not an unprimeable number, because it can be changed into a prime (221807413781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239532381 + ... + 239533306.

It is an arithmetic number, because the mean of its divisors is an integer number (55571619808).

Almost surely, 2^221807413081 is an apocalyptic number.

It is an amenable number.

221807413081 is a deficient number, since it is larger than the sum of its proper divisors (479066151).

221807413081 is an equidigital number, since it uses as much as digits as its factorization.

221807413081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479066150.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 221807413081 in words is "two hundred twenty-one billion, eight hundred seven million, four hundred thirteen thousand, eighty-one".