121121012220 has 72 divisors (see below), whose sum is σ = 367233206256. Its totient is φ = 29814400512.

The previous prime is 121121012209. The next prime is 121121012231. The reversal of 121121012220 is 22210121121.

It is an interprime number because it is at equal distance from previous prime (121121012209) and next prime (121121012231).

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 121121012220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5962297 + ... + 5982576.

It is an arithmetic number, because the mean of its divisors is an integer number (5100461198).

Almost surely, 2^121121012220 is an apocalyptic number.

121121012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121012220 is an abundant number, since it is smaller than the sum of its proper divisors (246112194036).

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

121121012220 is a wasteful number, since it uses less digits than its factorization.

121121012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11944911 (or 11944896 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121121012220 its reverse (22210121121), we get a palindrome (143331133341).

The spelling of 121121012220 in words is "one hundred twenty-one billion, one hundred twenty-one million, twelve thousand, two hundred twenty".