222202120212221 has 4 divisors (see below), whose sum is σ = 222204772600572. Its totient is φ = 222199467823872.

The previous prime is 222202120212209. The next prime is 222202120212227. The reversal of 222202120212221 is 122212021202222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163371471439225 + 58830648772996 = 12781685^2 + 7670114^2 .

It is a cyclic number.

It is not a de Polignac number, because 222202120212221 - 2⁶ = 222202120212157 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 (222202120212227) 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, 1326068510 + ... + 1326236063.

It is an arithmetic number, because the mean of its divisors is an integer number (55551193150143).

Almost surely, 2^{222202120212221} is an apocalyptic number.

It is an amenable number.

222202120212221 is a deficient number, since it is larger than the sum of its proper divisors (2652388351).

222202120212221 is an equidigital number, since it uses as much as digits as its factorization.

222202120212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652388350.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 222202120212221 its reverse (122212021202222), we get a palindrome (344414141414443).

Subtracting from 222202120212221 its reverse (122212021202222), we obtain a palindrome (99990099009999).

The spelling of 222202120212221 in words is "two hundred twenty-two trillion, two hundred two billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".