121011100100 has 72 divisors (see below), whose sum is σ = 286523098848. Its totient is φ = 43995308800.

The previous prime is 121011100087. The next prime is 121011100103. The reversal of 121011100100 is 1001110121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121011100103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8690744 + ... + 8704656.

It is an arithmetic number, because the mean of its divisors is an integer number (3979487484).

Almost surely, 2^121011100100 is an apocalyptic number.

121011100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121011100100 is an abundant number, since it is smaller than the sum of its proper divisors (165511998748).

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

121011100100 is a wasteful number, since it uses less digits than its factorization.

121011100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21845 (or 21838 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 121011100100 its reverse (1001110121), we get a palindrome (122012210221).

The spelling of 121011100100 in words is "one hundred twenty-one billion, eleven million, one hundred thousand, one hundred".