131201122121 has 4 divisors (see below), whose sum is σ = 131349038592. Its totient is φ = 131053205652.

The previous prime is 131201122103. The next prime is 131201122193. The reversal of 131201122121 is 121221102131.

It is a happy number.

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: 121221102131 = 137 ⋅884825563.

It is a cyclic number.

It is not a de Polignac number, because 131201122121 - 2³⁴ = 114021252937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131201122121.

It is not an unprimeable number, because it can be changed into a prime (131201122021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73956905 + ... + 73958678.

It is an arithmetic number, because the mean of its divisors is an integer number (32837259648).

Almost surely, 2^131201122121 is an apocalyptic number.

It is an amenable number.

131201122121 is a deficient number, since it is larger than the sum of its proper divisors (147916471).

131201122121 is an equidigital number, since it uses as much as digits as its factorization.

131201122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147916470.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 131201122121 its reverse (121221102131), we get a palindrome (252422224252).

The spelling of 131201122121 in words is "one hundred thirty-one billion, two hundred one million, one hundred twenty-two thousand, one hundred twenty-one".