131021222221021 has 4 divisors (see below), whose sum is σ = 142932242422944. Its totient is φ = 119110202019100.

The previous prime is 131021222221007. The next prime is 131021222221031. The reversal of 131021222221021 is 120122222120131.

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 a cyclic number.

It is not a de Polignac number, because 131021222221021 - 2²³ = 131021213832413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131021222220983 and 131021222221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021222221031) 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, 5955510100945 + ... + 5955510100966.

It is an arithmetic number, because the mean of its divisors is an integer number (35733060605736).

Almost surely, 2^{131021222221021} is an apocalyptic number.

131021222221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131021222221021 is a deficient number, since it is larger than the sum of its proper divisors (11911020201923).

131021222221021 is a wasteful number, since it uses less digits than its factorization.

131021222221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11911020201922.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 131021222221021 its reverse (120122222120131), we get a palindrome (251143444341152).

The spelling of 131021222221021 in words is "one hundred thirty-one trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".