121212100120 has 32 divisors (see below), whose sum is σ = 272774427120. Its totient is φ = 48476448640.

The previous prime is 121212100049. The next prime is 121212100171. The reversal of 121212100120 is 21001212121.

It is a self number, because there is not a number n which added to its sum of digits gives 121212100120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25591 + ... + 493030.

Almost surely, 2^121212100120 is an apocalyptic number.

121212100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212100120 is an abundant number, since it is smaller than the sum of its proper divisors (151562327000).

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

121212100120 is a wasteful number, since it uses less digits than its factorization.

121212100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524475 (or 524471 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121212100120 its reverse (21001212121), we get a palindrome (142213312241).

The spelling of 121212100120 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred thousand, one hundred twenty".