121200111000001 has 4 divisors (see below), whose sum is σ = 132218302909104. Its totient is φ = 110181919090900.

The previous prime is 121200110999993. The next prime is 121200111000019. The reversal of 121200111000001 is 100000111002121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121200111000001 - 2³ = 121200110999993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200111000071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5509095954535 + ... + 5509095954556.

It is an arithmetic number, because the mean of its divisors is an integer number (33054575727276).

Almost surely, 2^{121200111000001} is an apocalyptic number.

121200111000001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121200111000001 is a deficient number, since it is larger than the sum of its proper divisors (11018191909103).

121200111000001 is a wasteful number, since it uses less digits than its factorization.

121200111000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11018191909102.

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

Adding to 121200111000001 its reverse (100000111002121), we get a palindrome (221200222002122).

The spelling of 121200111000001 in words is "one hundred twenty-one trillion, two hundred billion, one hundred eleven million, one", and thus it is an aban number.