13921007 has 2 divisors, whose sum is σ = 13921008. Its totient is φ = 13921006.

The previous prime is 13921001. The next prime is 13921013. The reversal of 13921007 is 70012931.

It is a balanced prime because it is at equal distance from previous prime (13921001) and next prime (13921013).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13921007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13921001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6960503 + 6960504.

It is an arithmetic number, because the mean of its divisors is an integer number (6960504).

Almost surely, 2^13921007 is an apocalyptic number.

13921007 is a deficient number, since it is larger than the sum of its proper divisors (1).

13921007 is an equidigital number, since it uses as much as digits as its factorization.

13921007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 13921007 is about 3731.0865709603. The cubic root of 13921007 is about 240.5600750681.

Adding to 13921007 its reverse (70012931), we get a palindrome (83933938).

The spelling of 13921007 in words is "thirteen million, nine hundred twenty-one thousand, seven".