121200012123100 has 36 divisors (see below), whose sum is σ = 263004514930584. Its totient is φ = 48479914780480.

The previous prime is 121200012123089. The next prime is 121200012123163. The reversal of 121200012123100 is 1321210002121.

It is a super-2 number, since 2×121200012123100² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88333914 + ... + 89695486.

It is an arithmetic number, because the mean of its divisors is an integer number (7305680970294).

Almost surely, 2^{121200012123100} is an apocalyptic number.

121200012123100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200012123100 is an abundant number, since it is smaller than the sum of its proper divisors (141804502807484).

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

121200012123100 is a wasteful number, since it uses less digits than its factorization.

121200012123100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251734 (or 2251727 counting only the distinct ones).

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

Adding to 121200012123100 its reverse (1321210002121), we get a palindrome (122521222125221).

The spelling of 121200012123100 in words is "one hundred twenty-one trillion, two hundred billion, twelve million, one hundred twenty-three thousand, one hundred".