222122020121 has 4 divisors (see below), whose sum is σ = 222413902644. Its totient is φ = 221830137600.

The previous prime is 222122020097. The next prime is 222122020123. The reversal of 222122020121 is 121020221222.

It is a happy number.

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 11693394496 + 210428625625 = 108136^2 + 458725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222122020121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222122020121.

It is not an unprimeable number, because it can be changed into a prime (222122020123) 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, 145940120 + ... + 145941641.

It is an arithmetic number, because the mean of its divisors is an integer number (55603475661).

Almost surely, 2^222122020121 is an apocalyptic number.

It is an amenable number.

222122020121 is a deficient number, since it is larger than the sum of its proper divisors (291882523).

222122020121 is an equidigital number, since it uses as much as digits as its factorization.

222122020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291882522.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222122020121 its reverse (121020221222), we get a palindrome (343142241343).

The spelling of 222122020121 in words is "two hundred twenty-two billion, one hundred twenty-two million, twenty thousand, one hundred twenty-one".