131122223221 has 16 divisors (see below), whose sum is σ = 149816615040. Its totient is φ = 113595401920.

The previous prime is 131122223213. The next prime is 131122223237. The reversal of 131122223221 is 122322221131.

It is not a de Polignac number, because 131122223221 - 2³ = 131122223213 is a prime.

It is a super-2 number, since 2×131122223221² (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 = 131122223192 and 131122223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131122223261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 895270 + ... + 1031383.

It is an arithmetic number, because the mean of its divisors is an integer number (9363538440).

Almost surely, 2^131122223221 is an apocalyptic number.

131122223221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131122223221 is a deficient number, since it is larger than the sum of its proper divisors (18694391819).

131122223221 is a wasteful number, since it uses less digits than its factorization.

131122223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926956.

The product of its digits is 576, while the sum is 22.

Adding to 131122223221 its reverse (122322221131), we get a palindrome (253444444352).

The spelling of 131122223221 in words is "one hundred thirty-one billion, one hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty-one".