21422413 has 2 divisors, whose sum is σ = 21422414. Its totient is φ = 21422412.

The previous prime is 21422411. The next prime is 21422419. The reversal of 21422413 is 31422412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14884164 + 6538249 = 3858^2 + 2557^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422413 - 2¹ = 21422411 is a prime.

Together with 21422411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711206 + 10711207.

It is an arithmetic number, because the mean of its divisors is an integer number (10711207).

Almost surely, 2^21422413 is an apocalyptic number.

It is an amenable number.

21422413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422413 is an equidigital number, since it uses as much as digits as its factorization.

21422413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 21422413 is about 4628.4352647520. The cubic root of 21422413 is about 277.7300011283.

Adding to 21422413 its reverse (31422412), we get a palindrome (52844825).

Subtracting 21422413 from its reverse (31422412), we obtain a palindrome (9999999).

The spelling of 21422413 in words is "twenty-one million, four hundred twenty-two thousand, four hundred thirteen".