1321522023 has 4 divisors (see below), whose sum is σ = 1762029368. Its totient is φ = 881014680.

The previous prime is 1321522021. The next prime is 1321522039. The reversal of 1321522023 is 3202251231.

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

It is not a de Polignac number, because 1321522023 - 2¹ = 1321522021 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 (1321522021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220253668 + ... + 220253673.

It is an arithmetic number, because the mean of its divisors is an integer number (440507342).

Almost surely, 2^1321522023 is an apocalyptic number.

1321522023 is a deficient number, since it is larger than the sum of its proper divisors (440507345).

1321522023 is an equidigital number, since it uses as much as digits as its factorization.

1321522023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440507344.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1321522023 is about 36352.7443668288. The cubic root of 1321522023 is about 1097.3827647910.

Adding to 1321522023 its reverse (3202251231), we get a palindrome (4523773254).

The spelling of 1321522023 in words is "one billion, three hundred twenty-one million, five hundred twenty-two thousand, twenty-three".