21162343 has 4 divisors (see below), whose sum is σ = 21194280. Its totient is φ = 21130408.

The previous prime is 21162329. The next prime is 21162359. The reversal of 21162343 is 34326112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21162343 is a prime.

It is a super-3 number, since 3×21162343³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14953 + ... + 16306.

It is an arithmetic number, because the mean of its divisors is an integer number (5298570).

Almost surely, 2^21162343 is an apocalyptic number.

21162343 is a deficient number, since it is larger than the sum of its proper divisors (31937).

21162343 is an equidigital number, since it uses as much as digits as its factorization.

21162343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31936.

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

The square root of 21162343 is about 4600.2546668636. The cubic root of 21162343 is about 276.6015331907.

Adding to 21162343 its reverse (34326112), we get a palindrome (55488455).

The spelling of 21162343 in words is "twenty-one million, one hundred sixty-two thousand, three hundred forty-three".