121200110001 has 16 divisors (see below), whose sum is σ = 179609086720. Its totient is φ = 80776057680.

The previous prime is 121200109997. The next prime is 121200110077. The reversal of 121200110001 is 100011002121.

It is a happy number.

It is not a de Polignac number, because 121200110001 - 2² = 121200109997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200110081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574345 + ... + 756486.

It is an arithmetic number, because the mean of its divisors is an integer number (11225567920).

Almost surely, 2^121200110001 is an apocalyptic number.

It is an amenable number.

121200110001 is a deficient number, since it is larger than the sum of its proper divisors (58408976719).

121200110001 is a wasteful number, since it uses less digits than its factorization.

121200110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334213 (or 1334207 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121200110001 its reverse (100011002121), we get a palindrome (221211112122).

The spelling of 121200110001 in words is "one hundred twenty-one billion, two hundred million, one hundred ten thousand, one".