21362413 has 2 divisors, whose sum is σ = 21362414. Its totient is φ = 21362412.

The previous prime is 21362381. The next prime is 21362417. The reversal of 21362413 is 31426312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15896169 + 5466244 = 3987^2 + 2338^2 .

It is a cyclic number.

It is not a de Polignac number, because 21362413 - 2⁵ = 21362381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21362417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681206 + 10681207.

It is an arithmetic number, because the mean of its divisors is an integer number (10681207).

Almost surely, 2^21362413 is an apocalyptic number.

It is an amenable number.

21362413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21362413 is an equidigital number, since it uses as much as digits as its factorization.

21362413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 21362413 is about 4621.9490477503. The cubic root of 21362413 is about 277.4704694924.

Adding to 21362413 its reverse (31426312), we get a palindrome (52788725).

It can be divided in two parts, 213 and 62413, that added together give a palindrome (62626).

The spelling of 21362413 in words is "twenty-one million, three hundred sixty-two thousand, four hundred thirteen".