131202442121 has 6 divisors (see below), whose sum is σ = 139374220830. Its totient is φ = 123484651136.

The previous prime is 131202442117. The next prime is 131202442139. The reversal of 131202442121 is 121244202131.

It can be written as a sum of positive squares in 3 ways, for example, as 55887324025 + 75315118096 = 236405^2 + 274436^2 .

It is not a de Polignac number, because 131202442121 - 2² = 131202442117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131202442141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226993556 + ... + 226994133.

It is an arithmetic number, because the mean of its divisors is an integer number (23229036805).

Almost surely, 2^131202442121 is an apocalyptic number.

It is an amenable number.

131202442121 is a deficient number, since it is larger than the sum of its proper divisors (8171778709).

131202442121 is an equidigital number, since it uses as much as digits as its factorization.

131202442121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453987723 (or 453987706 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 131202442121 its reverse (121244202131), we get a palindrome (252446644252).

The spelling of 131202442121 in words is "one hundred thirty-one billion, two hundred two million, four hundred forty-two thousand, one hundred twenty-one".