21234006 has 24 divisors (see below), whose sum is σ = 46094880. Its totient is φ = 7064496.

The previous prime is 21233999. The next prime is 21234007. The reversal of 21234006 is 60043212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 21234006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14211 + ... + 15633.

It is an arithmetic number, because the mean of its divisors is an integer number (1920620).

Almost surely, 2^21234006 is an apocalyptic number.

21234006 is an abundant number, since it is smaller than the sum of its proper divisors (24860874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21234006 is a wasteful number, since it uses less digits than its factorization.

21234006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260 (or 2257 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21234006 is about 4608.0371092256. The cubic root of 21234006 is about 276.9134041849.

Adding to 21234006 its reverse (60043212), we get a palindrome (81277218).

The spelling of 21234006 in words is "twenty-one million, two hundred thirty-four thousand, six".