13340021 has 2 divisors, whose sum is σ = 13340022. Its totient is φ = 13340020.

The previous prime is 13340003. The next prime is 13340027. The reversal of 13340021 is 12004331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10329796 + 3010225 = 3214^2 + 1735^2 .

It is an emirp because it is prime and its reverse (12004331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13340021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13339978 and 13340005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13340027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6670010 + 6670011.

It is an arithmetic number, because the mean of its divisors is an integer number (6670011).

Almost surely, 2^13340021 is an apocalyptic number.

It is an amenable number.

13340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13340021 is an equidigital number, since it uses as much as digits as its factorization.

13340021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13340021 is about 3652.3993483736. The cubic root of 13340021 is about 237.1658592008.

Adding to 13340021 its reverse (12004331), we get a palindrome (25344352).

The spelling of 13340021 in words is "thirteen million, three hundred forty thousand, twenty-one".