100002220121 has 4 divisors (see below), whose sum is σ = 100175534772. Its totient is φ = 99828905472.

The previous prime is 100002220057. The next prime is 100002220177. The reversal of 100002220121 is 121022200001.

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 94642369600 + 5359850521 = 307640^2 + 73211^2 .

It is a cyclic number.

It is not a de Polignac number, because 100002220121 - 2⁶ = 100002220057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100002229121) 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, 86656460 + ... + 86657613.

It is an arithmetic number, because the mean of its divisors is an integer number (25043883693).

Almost surely, 2^100002220121 is an apocalyptic number.

It is an amenable number.

100002220121 is a deficient number, since it is larger than the sum of its proper divisors (173314651).

100002220121 is an equidigital number, since it uses as much as digits as its factorization.

100002220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173314650.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100002220121 its reverse (121022200001), we get a palindrome (221024420122).

The spelling of 100002220121 in words is "one hundred billion, two million, two hundred twenty thousand, one hundred twenty-one".