13736021 has 4 divisors (see below), whose sum is σ = 14792652. Its totient is φ = 12679392.

The previous prime is 13735999. The next prime is 13736029. The reversal of 13736021 is 12063731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12063731 = 1031 ⋅11701.

It can be written as a sum of positive squares in 2 ways, for example, as 703921 + 13032100 = 839^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 13736021 - 2²² = 9541717 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 (13736029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528296 + ... + 528321.

It is an arithmetic number, because the mean of its divisors is an integer number (3698163).

Almost surely, 2^13736021 is an apocalyptic number.

It is an amenable number.

13736021 is a deficient number, since it is larger than the sum of its proper divisors (1056631).

13736021 is a wasteful number, since it uses less digits than its factorization.

13736021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056630.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 13736021 is about 3706.2138362485. The cubic root of 13736021 is about 239.4897783449.

Adding to 13736021 its reverse (12063731), we get a palindrome (25799752).

The spelling of 13736021 in words is "thirteen million, seven hundred thirty-six thousand, twenty-one".