1321301231 has 2 divisors, whose sum is σ = 1321301232. Its totient is φ = 1321301230.

The previous prime is 1321301221. The next prime is 1321301243. The reversal of 1321301231 is 1321031231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321301231 - 2¹⁰ = 1321300207 is a prime.

It is a super-2 number, since 2×1321301231² = 3491673886084230722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321301221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660650615 + 660650616.

It is an arithmetic number, because the mean of its divisors is an integer number (660650616).

Almost surely, 2^1321301231 is an apocalyptic number.

1321301231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321301231 is an equidigital number, since it uses as much as digits as its factorization.

1321301231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1321301231 is about 36349.7074403633. The cubic root of 1321301231 is about 1097.3216466696.

Adding to 1321301231 its reverse (1321031231), we get a palindrome (2642332462).

The spelling of 1321301231 in words is "one billion, three hundred twenty-one million, three hundred one thousand, two hundred thirty-one".