13426421 has 2 divisors, whose sum is σ = 13426422. Its totient is φ = 13426420.

The previous prime is 13426409. The next prime is 13426423. The reversal of 13426421 is 12462431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 1661521 = 3430^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 13426421 - 2²² = 9232117 is a prime.

Together with 13426423, 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 (13426423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6713210 + 6713211.

It is an arithmetic number, because the mean of its divisors is an integer number (6713211).

Almost surely, 2^13426421 is an apocalyptic number.

It is an amenable number.

13426421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13426421 is an equidigital number, since it uses as much as digits as its factorization.

13426421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 13426421 is about 3664.2080999856. The cubic root of 13426421 is about 237.6767791880.

Adding to 13426421 its reverse (12462431), we get a palindrome (25888852).

The spelling of 13426421 in words is "thirteen million, four hundred twenty-six thousand, four hundred twenty-one".