13121023 has 4 divisors (see below), whose sum is σ = 13199760. Its totient is φ = 13042288.

The previous prime is 13120999. The next prime is 13121033. The reversal of 13121023 is 32012131.

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-13121023 is a prime.

It is a super-2 number, since 2×13121023² = 344322489133058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13120994 and 13121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121033) 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, 39118 + ... + 39451.

It is an arithmetic number, because the mean of its divisors is an integer number (3299940).

Almost surely, 2^13121023 is an apocalyptic number.

13121023 is a deficient number, since it is larger than the sum of its proper divisors (78737).

13121023 is an equidigital number, since it uses as much as digits as its factorization.

13121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78736.

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

The square root of 13121023 is about 3622.2952668163. The cubic root of 13121023 is about 235.8608715056.

Adding to 13121023 its reverse (32012131), we get a palindrome (45133154).

The spelling of 13121023 in words is "thirteen million, one hundred twenty-one thousand, twenty-three".