1321201231 has 8 divisors (see below), whose sum is σ = 1530629024. Its totient is φ = 1116944640.

The previous prime is 1321201229. The next prime is 1321201237. The reversal of 1321201231 is 1321021231.

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

It is not a de Polignac number, because 1321201231 - 2¹ = 1321201229 is a prime.

It is a super-2 number, since 2×1321201231² = 3491145385591830722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321201237) 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, 1292250 + ... + 1293271.

It is an arithmetic number, because the mean of its divisors is an integer number (191328628).

Almost surely, 2^1321201231 is an apocalyptic number.

1321201231 is a deficient number, since it is larger than the sum of its proper divisors (209427793).

1321201231 is an equidigital number, since it uses as much as digits as its factorization.

1321201231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585601.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321201231 is about 36348.3318874470. The cubic root of 1321201231 is about 1097.2939631179.

Adding to 1321201231 its reverse (1321021231), we get a palindrome (2642222462).

The spelling of 1321201231 in words is "one billion, three hundred twenty-one million, two hundred one thousand, two hundred thirty-one".