121220012120 has 32 divisors (see below), whose sum is σ = 277891164720. Its totient is φ = 47573136000.

The previous prime is 121220012113. The next prime is 121220012129. The reversal of 121220012120 is 21210022121.

It is a junction number, because it is equal to n+sod(n) for n = 121220012095 and 121220012104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220012129) 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, 28587506 + ... + 28591745.

Almost surely, 2^121220012120 is an apocalyptic number.

121220012120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220012120 is an abundant number, since it is smaller than the sum of its proper divisors (156671152600).

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

121220012120 is a wasteful number, since it uses less digits than its factorization.

121220012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57179315 (or 57179311 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121220012120 its reverse (21210022121), we get a palindrome (142430034241).

The spelling of 121220012120 in words is "one hundred twenty-one billion, two hundred twenty million, twelve thousand, one hundred twenty".