21326342 has 4 divisors (see below), whose sum is σ = 31989516. Its totient is φ = 10663170.

The previous prime is 21326309. The next prime is 21326351. The reversal of 21326342 is 24362312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331584 + ... + 5331587.

It is an arithmetic number, because the mean of its divisors is an integer number (7997379).

Almost surely, 2^21326342 is an apocalyptic number.

21326342 is a deficient number, since it is larger than the sum of its proper divisors (10663174).

21326342 is a wasteful number, since it uses less digits than its factorization.

21326342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663173.

The product of its digits is 1728, while the sum is 23.

The square root of 21326342 is about 4618.0452574655. The cubic root of 21326342 is about 277.3142094313.

Adding to 21326342 its reverse (24362312), we get a palindrome (45688654).

The spelling of 21326342 in words is "twenty-one million, three hundred twenty-six thousand, three hundred forty-two".