121210221320123 has 4 divisors (see below), whose sum is σ = 130534084498608. Its totient is φ = 111886358141640.

The previous prime is 121210221320081. The next prime is 121210221320207. The reversal of 121210221320123 is 321023122012121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210221320123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121210221320723) 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, 4661931589223 + ... + 4661931589248.

It is an arithmetic number, because the mean of its divisors is an integer number (32633521124652).

Almost surely, 2^{121210221320123} is an apocalyptic number.

121210221320123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121210221320123 is a deficient number, since it is larger than the sum of its proper divisors (9323863178485).

121210221320123 is an equidigital number, since it uses as much as digits as its factorization.

121210221320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323863178484.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 121210221320123 its reverse (321023122012121), we get a palindrome (442233343332244).

The spelling of 121210221320123 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twenty-one million, three hundred twenty thousand, one hundred twenty-three".