131121322221 has 8 divisors (see below), whose sum is σ = 174866037664. Its totient is φ = 87395410800.

The previous prime is 131121322147. The next prime is 131121322231. The reversal of 131121322221 is 122223121131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131121322221 - 2⁷ = 131121322093 is a prime.

It is a super-2 number, since 2×131121322221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121322231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4684726 + ... + 4712631.

It is an arithmetic number, because the mean of its divisors is an integer number (21858254708).

Almost surely, 2^131121322221 is an apocalyptic number.

It is an amenable number.

131121322221 is a deficient number, since it is larger than the sum of its proper divisors (43744715443).

131121322221 is an equidigital number, since it uses as much as digits as its factorization.

131121322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9402011.

The product of its digits is 288, while the sum is 21.

Adding to 131121322221 its reverse (122223121131), we get a palindrome (253344443352).

The spelling of 131121322221 in words is "one hundred thirty-one billion, one hundred twenty-one million, three hundred twenty-two thousand, two hundred twenty-one".