121211100100 has 36 divisors (see below), whose sum is σ = 266197118544. Its totient is φ = 47900286880.

The previous prime is 121211100083. The next prime is 121211100133. The reversal of 121211100100 is 1001112121.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 7293574 + ... + 7310173.

It is an arithmetic number, because the mean of its divisors is an integer number (7394364404).

Almost surely, 2^121211100100 is an apocalyptic number.

121211100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211100100 is an abundant number, since it is smaller than the sum of its proper divisors (144986018444).

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

121211100100 is a wasteful number, since it uses less digits than its factorization.

121211100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14603844 (or 14603837 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121211100100 its reverse (1001112121), we get a palindrome (122212212221).

The spelling of 121211100100 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred thousand, one hundred".