1231430221 has 12 divisors (see below), whose sum is σ = 1462961088. Its totient is φ = 1033051992.

The previous prime is 1231430197. The next prime is 1231430231. The reversal of 1231430221 is 1220341321.

It is a happy number.

It is not a de Polignac number, because 1231430221 - 2⁷ = 1231430093 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 (1231430231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265051 + ... + 269656.

It is an arithmetic number, because the mean of its divisors is an integer number (121913424).

Almost surely, 2^1231430221 is an apocalyptic number.

It is an amenable number.

1231430221 is a deficient number, since it is larger than the sum of its proper divisors (231530867).

1231430221 is an equidigital number, since it uses as much as digits as its factorization.

1231430221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534768 (or 534761 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1231430221 is about 35091.7400679989. The cubic root of 1231430221 is about 1071.8563927910.

Adding to 1231430221 its reverse (1220341321), we get a palindrome (2451771542).

Subtracting from 1231430221 its reverse (1220341321), we obtain a square (11088900 = 3330²).

The spelling of 1231430221 in words is "one billion, two hundred thirty-one million, four hundred thirty thousand, two hundred twenty-one".