221422775343621 has 4 divisors (see below), whose sum is σ = 295230367124832. Its totient is φ = 147615183562412.

The previous prime is 221422775343611. The next prime is 221422775343647. The reversal of 221422775343621 is 126343577224122.

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 221422775343621 - 2⁵ = 221422775343589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422775343611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36903795890601 + ... + 36903795890606.

It is an arithmetic number, because the mean of its divisors is an integer number (73807591781208).

Almost surely, 2^{221422775343621} is an apocalyptic number.

It is an amenable number.

221422775343621 is a deficient number, since it is larger than the sum of its proper divisors (73807591781211).

221422775343621 is an equidigital number, since it uses as much as digits as its factorization.

221422775343621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73807591781210.

The product of its digits is 6773760, while the sum is 51.

The spelling of 221422775343621 in words is "two hundred twenty-one trillion, four hundred twenty-two billion, seven hundred seventy-five million, three hundred forty-three thousand, six hundred twenty-one".