121200021000011 has 4 divisors (see below), whose sum is σ = 124156119073224. Its totient is φ = 118243922926800.

The previous prime is 121200020999899. The next prime is 121200021000031. The reversal of 121200021000011 is 110000120002121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121200021000011 - 2¹⁴ = 121200020983627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200020999956 and 121200021000001.

It is not an unprimeable number, because it can be changed into a prime (121200021000031) 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, 1478049036545 + ... + 1478049036626.

It is an arithmetic number, because the mean of its divisors is an integer number (31039029768306).

Almost surely, 2^{121200021000011} is an apocalyptic number.

121200021000011 is a deficient number, since it is larger than the sum of its proper divisors (2956098073213).

121200021000011 is an equidigital number, since it uses as much as digits as its factorization.

121200021000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956098073212.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121200021000011 its reverse (110000120002121), we get a palindrome (231200141002132).

The spelling of 121200021000011 in words is "one hundred twenty-one trillion, two hundred billion, twenty-one million, eleven", and thus it is an aban number.