21842343 has 12 divisors (see below), whose sum is σ = 33210840. Its totient is φ = 13795056.

The previous prime is 21842333. The next prime is 21842347. The reversal of 21842343 is 34324812.

It is not a de Polignac number, because 21842343 - 2⁶ = 21842279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842347) 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 11 ways as a sum of consecutive naturals, for example, 63696 + ... + 64037.

It is an arithmetic number, because the mean of its divisors is an integer number (2767570).

Almost surely, 2^21842343 is an apocalyptic number.

21842343 is a deficient number, since it is larger than the sum of its proper divisors (11368497).

21842343 is a wasteful number, since it uses less digits than its factorization.

21842343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127758 (or 127755 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21842343 is about 4673.5792493548. The cubic root of 21842343 is about 279.5329927782.

The spelling of 21842343 in words is "twenty-one million, eight hundred forty-two thousand, three hundred forty-three".