1321100023 has 4 divisors (see below), whose sum is σ = 1331184888. Its totient is φ = 1311015160.

The previous prime is 1321100009. The next prime is 1321100041. The reversal of 1321100023 is 3200011231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321100023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321099976 and 1321100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321130023) 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, 5042236 + ... + 5042497.

It is an arithmetic number, because the mean of its divisors is an integer number (332796222).

Almost surely, 2^1321100023 is an apocalyptic number.

1321100023 is a deficient number, since it is larger than the sum of its proper divisors (10084865).

1321100023 is a wasteful number, since it uses less digits than its factorization.

1321100023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10084864.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1321100023 is about 36346.9396648466. The cubic root of 1321100023 is about 1097.2659437264.

Adding to 1321100023 its reverse (3200011231), we get a palindrome (4521111254).

The spelling of 1321100023 in words is "one billion, three hundred twenty-one million, one hundred thousand, twenty-three".