121221212120 has 32 divisors (see below), whose sum is σ = 272836933200. Its totient is φ = 48472626048.

The previous prime is 121221212081. The next prime is 121221212131. The reversal of 121221212120 is 21212122121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371375 + ... + 616734.

Almost surely, 2^121221212120 is an apocalyptic number.

121221212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221212120 is an abundant number, since it is smaller than the sum of its proper divisors (151615721080).

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

121221212120 is a wasteful number, since it uses less digits than its factorization.

121221212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991187 (or 991183 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221212120 its reverse (21212122121), we get a palindrome (142433334241).

The spelling of 121221212120 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twenty".