21235343 has 2 divisors, whose sum is σ = 21235344. Its totient is φ = 21235342.

The previous prime is 21235297. The next prime is 21235367. The reversal of 21235343 is 34353212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21235343 - 2²⁴ = 4458127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21235243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617671 + 10617672.

It is an arithmetic number, because the mean of its divisors is an integer number (10617672).

Almost surely, 2^21235343 is an apocalyptic number.

21235343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21235343 is an equidigital number, since it uses as much as digits as its factorization.

21235343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 23.

The square root of 21235343 is about 4608.1821795584. The cubic root of 21235343 is about 276.9192160173.

Adding to 21235343 its reverse (34353212), we get a palindrome (55588555).

The spelling of 21235343 in words is "twenty-one million, two hundred thirty-five thousand, three hundred forty-three".