12121312101 has 4 divisors (see below), whose sum is σ = 16161749472. Its totient is φ = 8080874732.

The previous prime is 12121312081. The next prime is 12121312117. The reversal of 12121312101 is 10121312121.

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: 10121312121 = 3 ⋅3373770707.

It is a cyclic number.

It is not a de Polignac number, because 12121312101 - 2⁹ = 12121311589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121312601) 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, 2020218681 + ... + 2020218686.

It is an arithmetic number, because the mean of its divisors is an integer number (4040437368).

Almost surely, 2^12121312101 is an apocalyptic number.

It is an amenable number.

12121312101 is a deficient number, since it is larger than the sum of its proper divisors (4040437371).

12121312101 is an equidigital number, since it uses as much as digits as its factorization.

12121312101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040437370.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12121312101 its reverse (10121312121), we get a palindrome (22242624222).

The spelling of 12121312101 in words is "twelve billion, one hundred twenty-one million, three hundred twelve thousand, one hundred one".