21202343 has 4 divisors (see below), whose sum is σ = 22124208. Its totient is φ = 20280480.

The previous prime is 21202283. The next prime is 21202367. The reversal of 21202343 is 34320212.

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

It is not a de Polignac number, because 21202343 - 2¹⁶ = 21136807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460898 + ... + 460943.

It is an arithmetic number, because the mean of its divisors is an integer number (5531052).

Almost surely, 2^21202343 is an apocalyptic number.

21202343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21202343 is a deficient number, since it is larger than the sum of its proper divisors (921865).

21202343 is an equidigital number, since it uses as much as digits as its factorization.

21202343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921864.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21202343 is about 4604.6001998002. The cubic root of 21202343 is about 276.7756962899.

Adding to 21202343 its reverse (34320212), we get a palindrome (55522555).

The spelling of 21202343 in words is "twenty-one million, two hundred two thousand, three hundred forty-three".