1321320023 has 4 divisors (see below), whose sum is σ = 1322406960. Its totient is φ = 1320233088.

The previous prime is 1321319981. The next prime is 1321320041. The reversal of 1321320023 is 3200231231.

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 1321320023 - 2⁶ = 1321319959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321319983 and 1321320010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321320043) 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, 541643 + ... + 544076.

It is an arithmetic number, because the mean of its divisors is an integer number (330601740).

Almost surely, 2^1321320023 is an apocalyptic number.

1321320023 is a deficient number, since it is larger than the sum of its proper divisors (1086937).

1321320023 is a wasteful number, since it uses less digits than its factorization.

1321320023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086936.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 1321320023 is about 36349.9659284572. The cubic root of 1321320023 is about 1097.3268488068.

Adding to 1321320023 its reverse (3200231231), we get a palindrome (4521551254).

The spelling of 1321320023 in words is "one billion, three hundred twenty-one million, three hundred twenty thousand, twenty-three".