121220022222 has 36 divisors (see below), whose sum is σ = 284400828504. Its totient is φ = 37298467440.

The previous prime is 121220022199. The next prime is 121220022239. The reversal of 121220022222 is 222220022121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121220022195 and 121220022204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19921354 + ... + 19927437.

It is an arithmetic number, because the mean of its divisors is an integer number (7900023014).

Almost surely, 2^121220022222 is an apocalyptic number.

121220022222 is an abundant number, since it is smaller than the sum of its proper divisors (163180806282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220022222 is a wasteful number, since it uses less digits than its factorization.

121220022222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39848825 (or 39848809 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 121220022222 its reverse (222220022121), we get a palindrome (343440044343).

The spelling of 121220022222 in words is "one hundred twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred twenty-two".