13076721 has 20 divisors (see below), whose sum is σ = 22325952. Its totient is φ = 7472088.

The previous prime is 13076717. The next prime is 13076737. The reversal of 13076721 is 12767031.

13076721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13076721 - 2² = 13076717 is a prime.

It is a super-2 number, since 2×13076721² = 342001264223682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13076711) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10965 + ... + 12098.

Almost surely, 2^13076721 is an apocalyptic number.

It is an amenable number.

13076721 is a deficient number, since it is larger than the sum of its proper divisors (9249231).

13076721 is an equidigital number, since it uses as much as digits as its factorization.

13076721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23082 (or 23073 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 13076721 is about 3616.1749128050. The cubic root of 13076721 is about 235.5951175673.

The spelling of 13076721 in words is "thirteen million, seventy-six thousand, seven hundred twenty-one".