222121122222101 has 4 divisors (see below), whose sum is σ = 222123371944812. Its totient is φ = 222118872499392.

The previous prime is 222121122222049. The next prime is 222121122222107. The reversal of 222121122222101 is 101222221121222.

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 13196472963025 + 208924649259076 = 3632695^2 + 14454226^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121122222101 - 2²² = 222121118027797 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 (222121122222107) 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, 1124713250 + ... + 1124910723.

It is an arithmetic number, because the mean of its divisors is an integer number (55530842986203).

Almost surely, 2^{222121122222101} is an apocalyptic number.

It is an amenable number.

222121122222101 is a deficient number, since it is larger than the sum of its proper divisors (2249722711).

222121122222101 is an equidigital number, since it uses as much as digits as its factorization.

222121122222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249722710.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222121122222101 its reverse (101222221121222), we get a palindrome (323343343343323).

The spelling of 222121122222101 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred one".