121021221220 has 12 divisors (see below), whose sum is σ = 254144564604. Its totient is φ = 48408488480.

The previous prime is 121021221199. The next prime is 121021221241. The reversal of 121021221220 is 22122120121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121021221199) and next prime (121021221241).

It can be written as a sum of positive squares in 2 ways, for example, as 52875162916 + 68146058304 = 229946^2 + 261048^2 .

It is a super-2 number, since 2×121021221220² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121021221194 and 121021221203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3025530511 + ... + 3025530550.

It is an arithmetic number, because the mean of its divisors is an integer number (21178713717).

Almost surely, 2^121021221220 is an apocalyptic number.

121021221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021221220 is an abundant number, since it is smaller than the sum of its proper divisors (133123343384).

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

121021221220 is a wasteful number, since it uses less digits than its factorization.

121021221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6051061070 (or 6051061068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121021221220 its reverse (22122120121), we get a palindrome (143143341341).

The spelling of 121021221220 in words is "one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty".