121212212100 has 72 divisors (see below), whose sum is σ = 400808388288. Its totient is φ = 27705648000.

The previous prime is 121212212083. The next prime is 121212212123. The reversal of 121212212100 is 1212212121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121212212100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28857951 + ... + 28862150.

Almost surely, 2^121212212100 is an apocalyptic number.

121212212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212212100 is an abundant number, since it is smaller than the sum of its proper divisors (279596176188).

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

121212212100 is a wasteful number, since it uses less digits than its factorization.

121212212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57720125 (or 57720118 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121212212100 its reverse (1212212121), we get a palindrome (122424424221).

The spelling of 121212212100 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred".