131201121121 has 4 divisors (see below), whose sum is σ = 149944138432. Its totient is φ = 112458103812.

The previous prime is 131201121091. The next prime is 131201121131. The reversal of 131201121121 is 121121102131.

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.

It is a cyclic number.

It is not a de Polignac number, because 131201121121 - 2⁷ = 131201120993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131201121095 and 131201121104.

It is not an unprimeable number, because it can be changed into a prime (131201121131) 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, 9371508645 + ... + 9371508658.

It is an arithmetic number, because the mean of its divisors is an integer number (37486034608).

Almost surely, 2^131201121121 is an apocalyptic number.

It is an amenable number.

131201121121 is a deficient number, since it is larger than the sum of its proper divisors (18743017311).

131201121121 is an equidigital number, since it uses as much as digits as its factorization.

131201121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18743017310.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 131201121121 its reverse (121121102131), we get a palindrome (252322223252).

The spelling of 131201121121 in words is "one hundred thirty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred twenty-one".