121112312220 has 72 divisors (see below), whose sum is σ = 388984259664. Its totient is φ = 30396814848.

The previous prime is 121112312219. The next prime is 121112312221. The reversal of 121112312220 is 22213211121.

121112312220 is a `hidden beast` number, since 1 + 21 + 112 + 312 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (121112312219) and next prime (121112312221).

It is a super-2 number, since 2×121112312220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121112312193 and 121112312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112312221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19786534 + ... + 19792653.

It is an arithmetic number, because the mean of its divisors is an integer number (5402559162).

Almost surely, 2^121112312220 is an apocalyptic number.

121112312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121112312220 is an abundant number, since it is smaller than the sum of its proper divisors (267871947444).

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

121112312220 is a wasteful number, since it uses less digits than its factorization.

121112312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39579219 (or 39579214 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121112312220 its reverse (22213211121), we get a palindrome (143325523341).

The spelling of 121112312220 in words is "one hundred twenty-one billion, one hundred twelve million, three hundred twelve thousand, two hundred twenty".