131221312022 has 16 divisors (see below), whose sum is σ = 197847014400. Its totient is φ = 65272394088.

The previous prime is 131221312009. The next prime is 131221312073. The reversal of 131221312022 is 220213122131.

It is a junction number, because it is equal to n+sod(n) for n = 131221311985 and 131221312003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3918353 + ... + 3951699.

It is an arithmetic number, because the mean of its divisors is an integer number (12365438400).

Almost surely, 2^131221312022 is an apocalyptic number.

131221312022 is a deficient number, since it is larger than the sum of its proper divisors (66625702378).

131221312022 is a wasteful number, since it uses less digits than its factorization.

131221312022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43435.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 131221312022 its reverse (220213122131), we get a palindrome (351434434153).

The spelling of 131221312022 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred twelve thousand, twenty-two".