21334623 has 8 divisors (see below), whose sum is σ = 28712448. Its totient is φ = 14089944.

The previous prime is 21334613. The next prime is 21334631. The reversal of 21334623 is 32643312.

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

It is not a de Polignac number, because 21334623 - 2⁶ = 21334559 is a prime.

It is a super-2 number, since 2×21334623² = 910332277104258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21334593 and 21334602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32911 + ... + 33552.

It is an arithmetic number, because the mean of its divisors is an integer number (3589056).

Almost surely, 2^21334623 is an apocalyptic number.

21334623 is a deficient number, since it is larger than the sum of its proper divisors (7377825).

21334623 is a wasteful number, since it uses less digits than its factorization.

21334623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66573.

The product of its digits is 2592, while the sum is 24.

The square root of 21334623 is about 4618.9417619191. The cubic root of 21334623 is about 277.3500984084.

Adding to 21334623 its reverse (32643312), we get a palindrome (53977935).

The spelling of 21334623 in words is "twenty-one million, three hundred thirty-four thousand, six hundred twenty-three".