131201233021 has 4 divisors (see below), whose sum is σ = 135725413500. Its totient is φ = 126677052544.

The previous prime is 131201233003. The next prime is 131201233049. The reversal of 131201233021 is 120332102131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28808272900 + 102392960121 = 169730^2 + 319989^2 .

It is a cyclic number.

It is not a de Polignac number, because 131201233021 - 2⁵ = 131201232989 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 131201233021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131201233091) 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, 2262090196 + ... + 2262090253.

It is an arithmetic number, because the mean of its divisors is an integer number (33931353375).

Almost surely, 2^131201233021 is an apocalyptic number.

It is an amenable number.

131201233021 is a deficient number, since it is larger than the sum of its proper divisors (4524180479).

131201233021 is an equidigital number, since it uses as much as digits as its factorization.

131201233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524180478.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 131201233021 its reverse (120332102131), we get a palindrome (251533335152).

The spelling of 131201233021 in words is "one hundred thirty-one billion, two hundred one million, two hundred thirty-three thousand, twenty-one".