121001100012100 has 144 divisors (see below), whose sum is σ = 332911502300160. Its totient is φ = 37075397443200.

The previous prime is 121001100012049. The next prime is 121001100012101. The reversal of 121001100012100 is 1210001100121.

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

It is not an unprimeable number, because it can be changed into a prime (121001100012101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132718824 + ... + 133627423.

It is an arithmetic number, because the mean of its divisors is an integer number (2311885432640).

Almost surely, 2^{121001100012100} is an apocalyptic number.

121001100012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121001100012100 is an abundant number, since it is smaller than the sum of its proper divisors (211910402288060).

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

121001100012100 is a wasteful number, since it uses less digits than its factorization.

121001100012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266346338 (or 266346331 counting only the distinct ones).

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

Adding to 121001100012100 its reverse (1210001100121), we get a palindrome (122211101112221).

The spelling of 121001100012100 in words is "one hundred twenty-one trillion, one billion, one hundred million, twelve thousand, one hundred".