21343042 has 48 divisors (see below), whose sum is σ = 39940992. Its totient is φ = 8372160.

The previous prime is 21343039. The next prime is 21343111. The reversal of 21343042 is 24034312.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 207163 + ... + 207265.

It is an arithmetic number, because the mean of its divisors is an integer number (832104).

Almost surely, 2^21343042 is an apocalyptic number.

21343042 is a deficient number, since it is larger than the sum of its proper divisors (18597950).

21343042 is a wasteful number, since it uses less digits than its factorization.

21343042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21343042 is about 4619.8530279653. The cubic root of 21343042 is about 277.3865759439.

Adding to 21343042 its reverse (24034312), we get a palindrome (45377354).

The spelling of 21343042 in words is "twenty-one million, three hundred forty-three thousand, forty-two".