21002343 has 8 divisors (see below), whose sum is σ = 28292208. Its totient is φ = 13857024.

The previous prime is 21002341. The next prime is 21002357. The reversal of 21002343 is 34320012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21002343 - 2¹ = 21002341 is a prime.

It is a super-2 number, since 2×21002343² = 882196822979298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35796 + ... + 36377.

It is an arithmetic number, because the mean of its divisors is an integer number (3536526).

Almost surely, 2^21002343 is an apocalyptic number.

21002343 is a deficient number, since it is larger than the sum of its proper divisors (7289865).

21002343 is an equidigital number, since it uses as much as digits as its factorization.

21002343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72273.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21002343 is about 4582.8313300841. The cubic root of 21002343 is about 275.9026778269.

Adding to 21002343 its reverse (34320012), we get a palindrome (55322355).

The spelling of 21002343 in words is "twenty-one million, two thousand, three hundred forty-three".