131222330021 has 4 divisors (see below), whose sum is σ = 131223054912. Its totient is φ = 131221605132.

The previous prime is 131222330017. The next prime is 131222330027. The reversal of 131222330021 is 120033222131.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120033222131 = 827 ⋅145142953.

It is a cyclic number.

It is not a de Polignac number, because 131222330021 - 2² = 131222330017 is a prime.

It is a super-2 number, since 2×131222330021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131222329975 and 131222330002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131222330027) 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, 163220 + ... + 537666.

It is an arithmetic number, because the mean of its divisors is an integer number (32805763728).

Almost surely, 2^131222330021 is an apocalyptic number.

It is an amenable number.

131222330021 is a deficient number, since it is larger than the sum of its proper divisors (724891).

131222330021 is an equidigital number, since it uses as much as digits as its factorization.

131222330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724890.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 131222330021 its reverse (120033222131), we get a palindrome (251255552152).

The spelling of 131222330021 in words is "one hundred thirty-one billion, two hundred twenty-two million, three hundred thirty thousand, twenty-one".