13136723021 has 24 divisors (see below), whose sum is σ = 14465336520. Its totient is φ = 11913495552.

The previous prime is 13136722997. The next prime is 13136723027. The reversal of 13136723021 is 12032763131.

It can be written as a sum of positive squares in 12 ways, for example, as 2852734921 + 10283988100 = 53411^2 + 101410^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13136723021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13136723027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5136275 + ... + 5138831.

It is an arithmetic number, because the mean of its divisors is an integer number (602722355).

Almost surely, 2^13136723021 is an apocalyptic number.

It is an amenable number.

13136723021 is a deficient number, since it is larger than the sum of its proper divisors (1328613499).

13136723021 is a wasteful number, since it uses less digits than its factorization.

13136723021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233 (or 3216 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The spelling of 13136723021 in words is "thirteen billion, one hundred thirty-six million, seven hundred twenty-three thousand, twenty-one".