131122011221 has 4 divisors (see below), whose sum is σ = 131780916000. Its totient is φ = 130463106444.

The previous prime is 131122011197. The next prime is 131122011233. The reversal of 131122011221 is 122110221131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122110221131 = 373 ⋅327373247.

It is a cyclic number.

It is not a de Polignac number, because 131122011221 - 2³⁰ = 130048269397 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 131122011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131122011281) 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, 329452091 + ... + 329452488.

It is an arithmetic number, because the mean of its divisors is an integer number (32945229000).

Almost surely, 2^131122011221 is an apocalyptic number.

It is an amenable number.

131122011221 is a deficient number, since it is larger than the sum of its proper divisors (658904779).

131122011221 is an equidigital number, since it uses as much as digits as its factorization.

131122011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658904778.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 131122011221 its reverse (122110221131), we get a palindrome (253232232352).

The spelling of 131122011221 in words is "one hundred thirty-one billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".