182131221 has 4 divisors (see below), whose sum is σ = 242841632. Its totient is φ = 121420812.

The previous prime is 182131199. The next prime is 182131303. The reversal of 182131221 is 122131281.

182131221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 182131221 - 2⁵ = 182131189 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 (182131021) 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, 30355201 + ... + 30355206.

It is an arithmetic number, because the mean of its divisors is an integer number (60710408).

Almost surely, 2^182131221 is an apocalyptic number.

It is an amenable number.

182131221 is a deficient number, since it is larger than the sum of its proper divisors (60710411).

182131221 is an equidigital number, since it uses as much as digits as its factorization.

182131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60710410.

The product of its digits is 192, while the sum is 21.

The square root of 182131221 is about 13495.6000607605. The cubic root of 182131221 is about 566.8412751807.

The spelling of 182131221 in words is "one hundred eighty-two million, one hundred thirty-one thousand, two hundred twenty-one".