21342343 has 6 divisors (see below), whose sum is σ = 23459072. Its totient is φ = 19402020.

The previous prime is 21342341. The next prime is 21342359. The reversal of 21342343 is 34324312.

It is a happy number.

It is not a de Polignac number, because 21342343 - 2¹ = 21342341 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 (21342341) 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 5 ways as a sum of consecutive naturals, for example, 88071 + ... + 88312.

Almost surely, 2^21342343 is an apocalyptic number.

21342343 is a deficient number, since it is larger than the sum of its proper divisors (2116729).

21342343 is a wasteful number, since it uses less digits than its factorization.

21342343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176405 (or 176394 counting only the distinct ones).

The product of its digits is 1728, while the sum is 22.

The square root of 21342343 is about 4619.7773755886. Note that the first 3 decimals coincide. The cubic root of 21342343 is about 277.3835477074.

Adding to 21342343 its reverse (34324312), we get a palindrome (55666655).

The spelling of 21342343 in words is "twenty-one million, three hundred forty-two thousand, three hundred forty-three".