21340342 has 8 divisors (see below), whose sum is σ = 32875776. Its totient is φ = 10381752.

The previous prime is 21340339. The next prime is 21340351. The reversal of 21340342 is 24304312.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 144118 + ... + 144265.

It is an arithmetic number, because the mean of its divisors is an integer number (4109472).

Almost surely, 2^21340342 is an apocalyptic number.

21340342 is a deficient number, since it is larger than the sum of its proper divisors (11535434).

21340342 is a wasteful number, since it uses less digits than its factorization.

21340342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288422.

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

The square root of 21340342 is about 4619.5608016347. The cubic root of 21340342 is about 277.3748785276.

Adding to 21340342 its reverse (24304312), we get a palindrome (45644654).

The spelling of 21340342 in words is "twenty-one million, three hundred forty thousand, three hundred forty-two".