13768021 has 2 divisors, whose sum is σ = 13768022. Its totient is φ = 13768020.

The previous prime is 13767983. The next prime is 13768049. The reversal of 13768021 is 12086731.

It is an a-pointer prime, because the next prime (13768049) can be obtained adding 13768021 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9922500 + 3845521 = 3150^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 13768021 - 2⁷ = 13767893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13768081) 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 as a sum of consecutive naturals, namely, 6884010 + 6884011.

It is an arithmetic number, because the mean of its divisors is an integer number (6884011).

Almost surely, 2^13768021 is an apocalyptic number.

It is an amenable number.

13768021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13768021 is an equidigital number, since it uses as much as digits as its factorization.

13768021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 13768021 is about 3710.5283990289. The cubic root of 13768021 is about 239.6756091954.

The spelling of 13768021 in words is "thirteen million, seven hundred sixty-eight thousand, twenty-one".