21363434 has 8 divisors (see below), whose sum is σ = 32086560. Its totient is φ = 10667916.

The previous prime is 21363431. The next prime is 21363439. The reversal of 21363434 is 43436312.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21363431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4844 + ... + 8135.

It is an arithmetic number, because the mean of its divisors is an integer number (4010820).

Almost surely, 2^21363434 is an apocalyptic number.

21363434 is a deficient number, since it is larger than the sum of its proper divisors (10723126).

21363434 is a wasteful number, since it uses less digits than its factorization.

21363434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13804.

The product of its digits is 5184, while the sum is 26.

The square root of 21363434 is about 4622.0594976698. The cubic root of 21363434 is about 277.4748899174.

Adding to 21363434 its reverse (43436312), we get a palindrome (64799746).

The spelling of 21363434 in words is "twenty-one million, three hundred sixty-three thousand, four hundred thirty-four".