221222201200021 has 4 divisors (see below), whose sum is σ = 252825372800032. Its totient is φ = 189619029600012.

The previous prime is 221222201199977. The next prime is 221222201200073. The reversal of 221222201200021 is 120002102222122.

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 221222201200021 - 2⁷ = 221222201199893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222201200421) 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, 15801585799995 + ... + 15801585800008.

It is an arithmetic number, because the mean of its divisors is an integer number (63206343200008).

Almost surely, 2^{221222201200021} is an apocalyptic number.

It is an amenable number.

221222201200021 is a deficient number, since it is larger than the sum of its proper divisors (31603171600011).

221222201200021 is an equidigital number, since it uses as much as digits as its factorization.

221222201200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31603171600010.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221222201200021 its reverse (120002102222122), we get a palindrome (341224303422143).

The spelling of 221222201200021 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred thousand, twenty-one".