13999421 has 2 divisors, whose sum is σ = 13999422. Its totient is φ = 13999420.

The previous prime is 13999399. The next prime is 13999423. The reversal of 13999421 is 12499931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 1651225 = 3514^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 13999421 - 2¹⁴ = 13983037 is a prime.

Together with 13999423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13999423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6999710 + 6999711.

It is an arithmetic number, because the mean of its divisors is an integer number (6999711).

Almost surely, 2^13999421 is an apocalyptic number.

It is an amenable number.

13999421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13999421 is an equidigital number, since it uses as much as digits as its factorization.

13999421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 38.

The square root of 13999421 is about 3741.5800138444. The cubic root of 13999421 is about 241.0109038185.

The spelling of 13999421 in words is "thirteen million, nine hundred ninety-nine thousand, four hundred twenty-one".