121312122121 has 4 divisors (see below), whose sum is σ = 121316556672. Its totient is φ = 121307687572.

The previous prime is 121312122101. The next prime is 121312122133. The reversal of 121312122121 is 121221213121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121221213121 = 23 ⋅5270487527.

It is a cyclic number.

It is not a de Polignac number, because 121312122121 - 2¹⁷ = 121311991049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121312122101) 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, 2175985 + ... + 2231038.

It is an arithmetic number, because the mean of its divisors is an integer number (30329139168).

Almost surely, 2^121312122121 is an apocalyptic number.

It is an amenable number.

121312122121 is a deficient number, since it is larger than the sum of its proper divisors (4434551).

121312122121 is an equidigital number, since it uses as much as digits as its factorization.

121312122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434550.

The product of its digits is 96, while the sum is 19.

Adding to 121312122121 its reverse (121221213121), we get a palindrome (242533335242).

The spelling of 121312122121 in words is "one hundred twenty-one billion, three hundred twelve million, one hundred twenty-two thousand, one hundred twenty-one".