220222212121 has 4 divisors (see below), whose sum is σ = 220456243044. Its totient is φ = 219988181200.

The previous prime is 220222212113. The next prime is 220222212151. The reversal of 220222212121 is 121212222022.

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 76819882896 + 143402329225 = 277164^2 + 378685^2 .

It is a cyclic number.

It is not a de Polignac number, because 220222212121 - 2³ = 220222212113 is a prime.

It is a super-2 number, since 2×220222212121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220222212151) 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, 117014050 + ... + 117015931.

It is an arithmetic number, because the mean of its divisors is an integer number (55114060761).

Almost surely, 2^220222212121 is an apocalyptic number.

It is an amenable number.

220222212121 is a deficient number, since it is larger than the sum of its proper divisors (234030923).

220222212121 is an equidigital number, since it uses as much as digits as its factorization.

220222212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234030922.

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

Adding to 220222212121 its reverse (121212222022), we get a palindrome (341434434143).

Subtracting from 220222212121 its reverse (121212222022), we obtain a palindrome (99009990099).

The spelling of 220222212121 in words is "two hundred twenty billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".