1321023313 has 4 divisors (see below), whose sum is σ = 1349130240. Its totient is φ = 1292916388.

The previous prime is 1321023311. The next prime is 1321023323. The reversal of 1321023313 is 3133201231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3133201231 = 547 ⋅5727973.

It is a cyclic number.

It is not a de Polignac number, because 1321023313 - 2¹ = 1321023311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321023311) 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, 14053393 + ... + 14053486.

It is an arithmetic number, because the mean of its divisors is an integer number (337282560).

Almost surely, 2^1321023313 is an apocalyptic number.

It is an amenable number.

1321023313 is a deficient number, since it is larger than the sum of its proper divisors (28106927).

1321023313 is an equidigital number, since it uses as much as digits as its factorization.

1321023313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28106926.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1321023313 is about 36345.8844025015. The cubic root of 1321023313 is about 1097.2447056425.

Adding to 1321023313 its reverse (3133201231), we get a palindrome (4454224544).

The spelling of 1321023313 in words is "one billion, three hundred twenty-one million, twenty-three thousand, three hundred thirteen".