121220203220 has 48 divisors (see below), whose sum is σ = 260676396288. Its totient is φ = 47329054080.

The previous prime is 121220203219. The next prime is 121220203277. The reversal of 121220203220 is 22302022121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177755 + ... + 523485.

It is an arithmetic number, because the mean of its divisors is an integer number (5430758256).

Almost surely, 2^121220203220 is an apocalyptic number.

121220203220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220203220 is an abundant number, since it is smaller than the sum of its proper divisors (139456193068).

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

121220203220 is a wasteful number, since it uses less digits than its factorization.

121220203220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346160 (or 346158 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 121220203220 its reverse (22302022121), we get a palindrome (143522225341).

The spelling of 121220203220 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred three thousand, two hundred twenty".