121112122221220 has 24 divisors (see below), whose sum is σ = 273899722562424. Its totient is φ = 44718322050816.

The previous prime is 121112122221203. The next prime is 121112122221221. The reversal of 121112122221220 is 22122221211121.

It can be written as a sum of positive squares in 4 ways, for example, as 450157799844 + 120661964421376 = 670938^2 + 10984624^2 .

It is a super-2 number, since 2×121112122221220² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121112122221191 and 121112122221200.

It is not an unprimeable number, because it can be changed into a prime (121112122221221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232907927089 + ... + 232907927608.

It is an arithmetic number, because the mean of its divisors is an integer number (11412488440101).

Almost surely, 2^{121112122221220} is an apocalyptic number.

121112122221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121112122221220 is an abundant number, since it is smaller than the sum of its proper divisors (152787600341204).

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

121112122221220 is a wasteful number, since it uses less digits than its factorization.

121112122221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465815854719 (or 465815854717 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121112122221220 its reverse (22122221211121), we get a palindrome (143234343432341).

The spelling of 121112122221220 in words is "one hundred twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".