131221302111201 has 4 divisors (see below), whose sum is σ = 174961736148272. Its totient is φ = 87480868074132.

The previous prime is 131221302111199. The next prime is 131221302111223. The reversal of 131221302111201 is 102111203122131.

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 not a de Polignac number, because 131221302111201 - 2¹ = 131221302111199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221302111241) 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, 21870217018531 + ... + 21870217018536.

It is an arithmetic number, because the mean of its divisors is an integer number (43740434037068).

Almost surely, 2^{131221302111201} is an apocalyptic number.

It is an amenable number.

131221302111201 is a deficient number, since it is larger than the sum of its proper divisors (43740434037071).

131221302111201 is an equidigital number, since it uses as much as digits as its factorization.

131221302111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43740434037070.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 131221302111201 its reverse (102111203122131), we get a palindrome (233332505233332).

The spelling of 131221302111201 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, three hundred two million, one hundred eleven thousand, two hundred one".