21743413 has 2 divisors, whose sum is σ = 21743414. Its totient is φ = 21743412.

The previous prime is 21743341. The next prime is 21743419. The reversal of 21743413 is 31434712.

Together with previous prime (21743341) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15225604 + 6517809 = 3902^2 + 2553^2 .

It is a cyclic number.

It is not a de Polignac number, because 21743413 - 2²¹ = 19646261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21743419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10871706 + 10871707.

It is an arithmetic number, because the mean of its divisors is an integer number (10871707).

Almost surely, 2^21743413 is an apocalyptic number.

It is an amenable number.

21743413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21743413 is an equidigital number, since it uses as much as digits as its factorization.

21743413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 21743413 is about 4662.9832725413. The cubic root of 21743413 is about 279.1103266518.

The spelling of 21743413 in words is "twenty-one million, seven hundred forty-three thousand, four hundred thirteen".