121111210020100 has 72 divisors (see below), whose sum is σ = 266738379366368. Its totient is φ = 47720627539200.

The previous prime is 121111210020083. The next prime is 121111210020139. The reversal of 121111210020100 is 1020012111121.

It is a happy number.

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, 540464080 + ... + 540688120.

Almost surely, 2^{121111210020100} is an apocalyptic number.

121111210020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111210020100 is an abundant number, since it is smaller than the sum of its proper divisors (145627169346268).

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

121111210020100 is a wasteful number, since it uses less digits than its factorization.

121111210020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304805 (or 304798 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121111210020100 its reverse (1020012111121), we get a palindrome (122131222131221).

The spelling of 121111210020100 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred ten million, twenty thousand, one hundred".