121222212220 has 24 divisors (see below), whose sum is σ = 256819452624. Its totient is φ = 48059778816.

The previous prime is 121222212211. The next prime is 121222212301. The reversal of 121222212220 is 22212222121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26816814 + ... + 26821333.

It is an arithmetic number, because the mean of its divisors is an integer number (10700810526).

Almost surely, 2^121222212220 is an apocalyptic number.

121222212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222212220 is an abundant number, since it is smaller than the sum of its proper divisors (135597240404).

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

121222212220 is a wasteful number, since it uses less digits than its factorization.

121222212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53638269 (or 53638267 counting only the distinct ones).

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

Adding to 121222212220 its reverse (22212222121), we get a palindrome (143434434341).

Subtracting from 121222212220 its reverse (22212222121), we obtain a palindrome (99009990099).

The spelling of 121222212220 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty".