131221223 has 16 divisors (see below), whose sum is σ = 152622336. Its totient is φ = 110496960.

The previous prime is 131221213. The next prime is 131221229. The reversal of 131221223 is 322122131.

It is not a de Polignac number, because 131221223 - 2²² = 127026919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221229) 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, 250640 + ... + 251162.

It is an arithmetic number, because the mean of its divisors is an integer number (9538896).

Almost surely, 2^131221223 is an apocalyptic number.

131221223 is a deficient number, since it is larger than the sum of its proper divisors (21401113).

131221223 is an equidigital number, since it uses as much as digits as its factorization.

131221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094.

The product of its digits is 144, while the sum is 17.

The square root of 131221223 is about 11455.1832372948. The cubic root of 131221223 is about 508.1610343111.

Adding to 131221223 its reverse (322122131), we get a palindrome (453343354).

The spelling of 131221223 in words is "one hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-three".