21234412 has 24 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 10316880.

The previous prime is 21234401. The next prime is 21234427. The reversal of 21234412 is 21443212.

21234412 is nontrivially palindromic in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 21234412.

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, 33337 + ... + 33967.

It is an arithmetic number, because the mean of its divisors is an integer number (1592640).

Almost surely, 2^21234412 is an apocalyptic number.

It is an amenable number.

21234412 is a deficient number, since it is larger than the sum of its proper divisors (16988948).

21234412 is a wasteful number, since it uses less digits than its factorization.

21234412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 859 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 21234412 is about 4608.0811624797. The cubic root of 21234412 is about 276.9151690604.

Adding to 21234412 its reverse (21443212), we get a palindrome (42677624).

The spelling of 21234412 in words is "twenty-one million, two hundred thirty-four thousand, four hundred twelve".