131321101120021 has 4 divisors (see below), whose sum is σ = 131321132161600. Its totient is φ = 131321070078444.

The previous prime is 131321101119983. The next prime is 131321101120061. The reversal of 131321101120021 is 120021101123131.

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 131321101120021 - 2¹⁹ = 131321100595733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131321101120061) 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, 7941231 + ... + 18047308.

It is an arithmetic number, because the mean of its divisors is an integer number (32830283040400).

Almost surely, 2^{131321101120021} is an apocalyptic number.

It is an amenable number.

131321101120021 is a deficient number, since it is larger than the sum of its proper divisors (31041579).

131321101120021 is an equidigital number, since it uses as much as digits as its factorization.

131321101120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31041578.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 131321101120021 its reverse (120021101123131), we get a palindrome (251342202243152).

The spelling of 131321101120021 in words is "one hundred thirty-one trillion, three hundred twenty-one billion, one hundred one million, one hundred twenty thousand, twenty-one".