121121220222 has 12 divisors (see below), whose sum is σ = 262429310520. Its totient is φ = 40373740068.

The previous prime is 121121220221. The next prime is 121121220293. The reversal of 121121220222 is 222022121121.

It is a happy number.

121121220222 is a `hidden beast` number, since 1 + 211 + 212 + 20 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 6728956679 = 121121220222 / (1 + 2 + 1 + 1 + 2 + 1 + 2 + 2 + 0 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 121121220195 and 121121220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121220221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3364478322 + ... + 3364478357.

It is an arithmetic number, because the mean of its divisors is an integer number (21869109210).

Almost surely, 2^121121220222 is an apocalyptic number.

121121220222 is an abundant number, since it is smaller than the sum of its proper divisors (141308090298).

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

121121220222 is a wasteful number, since it uses less digits than its factorization.

121121220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6728956687 (or 6728956684 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121121220222 its reverse (222022121121), we get a palindrome (343143341343).

The spelling of 121121220222 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twenty-two".