1321013212231 has 4 divisors (see below), whose sum is σ = 1398719871792. Its totient is φ = 1243306552672.

The previous prime is 1321013212213. The next prime is 1321013212241. The reversal of 1321013212231 is 1322123101231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321013212231 - 2⁹ = 1321013211719 is a prime.

It is a super-2 number, since 2×1321013212231² (a number of 25 digits) 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 (1321013212241) 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, 38853329755 + ... + 38853329788.

It is an arithmetic number, because the mean of its divisors is an integer number (349679967948).

Almost surely, 2^{1321013212231} is an apocalyptic number.

1321013212231 is a deficient number, since it is larger than the sum of its proper divisors (77706659561).

1321013212231 is an equidigital number, since it uses as much as digits as its factorization.

1321013212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77706659560.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1321013212231 its reverse (1322123101231), we get a palindrome (2643136313462).

The spelling of 1321013212231 in words is "one trillion, three hundred twenty-one billion, thirteen million, two hundred twelve thousand, two hundred thirty-one".