21343430 has 16 divisors (see below), whose sum is σ = 38905920. Its totient is φ = 8428992.

The previous prime is 21343429. The next prime is 21343451. The reversal of 21343430 is 3434312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12719 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (2431620).

Almost surely, 2^21343430 is an apocalyptic number.

21343430 is a deficient number, since it is larger than the sum of its proper divisors (17562490).

21343430 is a wasteful number, since it uses less digits than its factorization.

21343430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27103.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 21343430 is about 4619.8950204523. The cubic root of 21343430 is about 277.3882568248.

Adding to 21343430 its reverse (3434312), we get a palindrome (24777742).

The spelling of 21343430 in words is "twenty-one million, three hundred forty-three thousand, four hundred thirty".