121220120220 has 48 divisors (see below), whose sum is σ = 339711418368. Its totient is φ = 32297262400.

The previous prime is 121220120159. The next prime is 121220120233. The reversal of 121220120220 is 22021022121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121220120220.

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, 808584 + ... + 946703.

It is an arithmetic number, because the mean of its divisors is an integer number (7077321216).

Almost surely, 2^121220120220 is an apocalyptic number.

121220120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220120220 is an abundant number, since it is smaller than the sum of its proper divisors (218491298148).

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

121220120220 is a wasteful number, since it uses less digits than its factorization.

121220120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756450 (or 1756448 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 121220120220 its reverse (22021022121), we get a palindrome (143241142341).

The spelling of 121220120220 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, two hundred twenty".