13671021 has 16 divisors (see below), whose sum is σ = 22434944. Its totient is φ = 7210944.

The previous prime is 13671011. The next prime is 13671041. The reversal of 13671021 is 12017631.

13671021 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 13671021 - 2⁵ = 13670989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13671011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24766 + ... + 25311.

It is an arithmetic number, because the mean of its divisors is an integer number (1402184).

Almost surely, 2^13671021 is an apocalyptic number.

It is an amenable number.

13671021 is a deficient number, since it is larger than the sum of its proper divisors (8763923).

13671021 is a wasteful number, since it uses less digits than its factorization.

13671021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50100.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 13671021 is about 3697.4343807565. The cubic root of 13671021 is about 239.1114190207. Note that the first 3 decimals are identical.

Adding to 13671021 its reverse (12017631), we get a palindrome (25688652).

The spelling of 13671021 in words is "thirteen million, six hundred seventy-one thousand, twenty-one".