221422047266021 has 4 divisors (see below), whose sum is σ = 253053768304032. Its totient is φ = 189790326228012.

The previous prime is 221422047265963. The next prime is 221422047266041. The reversal of 221422047266021 is 120662740224122.

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 221422047266021 - 2¹⁰ = 221422047264997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221422047266021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422047266041) 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 3 ways as a sum of consecutive naturals, for example, 15815860518995 + ... + 15815860519008.

It is an arithmetic number, because the mean of its divisors is an integer number (63263442076008).

Almost surely, 2^{221422047266021} is an apocalyptic number.

It is an amenable number.

221422047266021 is a deficient number, since it is larger than the sum of its proper divisors (31631721038011).

221422047266021 is an equidigital number, since it uses as much as digits as its factorization.

221422047266021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31631721038010.

The product of its (nonzero) digits is 258048, while the sum is 41.

The spelling of 221422047266021 in words is "two hundred twenty-one trillion, four hundred twenty-two billion, forty-seven million, two hundred sixty-six thousand, twenty-one".