131220223221 has 8 divisors (see below), whose sum is σ = 178682857344. Its totient is φ = 85618868960.

The previous prime is 131220223213. The next prime is 131220223243. The reversal of 131220223221 is 122322022131.

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

It is a cyclic number.

It is not a de Polignac number, because 131220223221 - 2³ = 131220223213 is a prime.

It is a super-2 number, since 2×131220223221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220223201) 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, 465319800 + ... + 465320081.

It is an arithmetic number, because the mean of its divisors is an integer number (22335357168).

Almost surely, 2^131220223221 is an apocalyptic number.

It is an amenable number.

131220223221 is a deficient number, since it is larger than the sum of its proper divisors (47462634123).

131220223221 is an equidigital number, since it uses as much as digits as its factorization.

131220223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930639931.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 131220223221 its reverse (122322022131), we get a palindrome (253542245352).

The spelling of 131220223221 in words is "one hundred thirty-one billion, two hundred twenty million, two hundred twenty-three thousand, two hundred twenty-one".