21118343 has 2 divisors, whose sum is σ = 21118344. Its totient is φ = 21118342.

The previous prime is 21118337. The next prime is 21118373. The reversal of 21118343 is 34381112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21118343 - 2¹⁰ = 21117319 is a prime.

It is a super-2 number, since 2×21118343² = 891968822131298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21118303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10559171 + 10559172.

It is an arithmetic number, because the mean of its divisors is an integer number (10559172).

Almost surely, 2^21118343 is an apocalyptic number.

21118343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21118343 is an equidigital number, since it uses as much as digits as its factorization.

21118343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 21118343 is about 4595.4698345218. The cubic root of 21118343 is about 276.4097001154.

Adding to 21118343 its reverse (34381112), we get a palindrome (55499455).

The spelling of 21118343 in words is "twenty-one million, one hundred eighteen thousand, three hundred forty-three".