121112213220 has 288 divisors, whose sum is σ = 392011716096. Its totient is φ = 30220646400.

The previous prime is 121112213213. The next prime is 121112213231. The reversal of 121112213220 is 22312211121.

121112213220 is a `hidden beast` number, since 12 + 111 + 221 + 322 + 0 = 666.

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 = 121112213193 and 121112213202.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19384137 + ... + 19390383.

It is an arithmetic number, because the mean of its divisors is an integer number (1361151792).

Almost surely, 2^121112213220 is an apocalyptic number.

121112213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121112213220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196005858048).

121112213220 is an abundant number, since it is smaller than the sum of its proper divisors (270899502876).

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

121112213220 is a wasteful number, since it uses less digits than its factorization.

121112213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6411 (or 6406 counting only the distinct ones).

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

Adding to 121112213220 its reverse (22312211121), we get a palindrome (143424424341).

The spelling of 121112213220 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred thirteen thousand, two hundred twenty".