121021311220 has 48 divisors (see below), whose sum is σ = 280794221568. Its totient is φ = 43580049920.

The previous prime is 121021311217. The next prime is 121021311293. The reversal of 121021311220 is 22113120121.

It is a junction number, because it is equal to n+sod(n) for n = 121021311194 and 121021311203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7730116 + ... + 7745755.

It is an arithmetic number, because the mean of its divisors is an integer number (5849879616).

Almost surely, 2^121021311220 is an apocalyptic number.

121021311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021311220 is an abundant number, since it is smaller than the sum of its proper divisors (159772910348).

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

121021311220 is a wasteful number, since it uses less digits than its factorization.

121021311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15475920 (or 15475918 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121021311220 its reverse (22113120121), we get a palindrome (143134431341).

The spelling of 121021311220 in words is "one hundred twenty-one billion, twenty-one million, three hundred eleven thousand, two hundred twenty".