21435412 has 12 divisors (see below), whose sum is σ = 37547776. Its totient is φ = 10707480.

The previous prime is 21435409. The next prime is 21435443. The reversal of 21435412 is 21453412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4063 + ... + 7705.

Almost surely, 2^21435412 is an apocalyptic number.

It is an amenable number.

21435412 is a deficient number, since it is larger than the sum of its proper divisors (16112364).

21435412 is a wasteful number, since it uses less digits than its factorization.

21435412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118 (or 5116 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21435412 is about 4629.8393060667. The cubic root of 21435412 is about 277.7861647720.

Adding to 21435412 its reverse (21453412), we get a palindrome (42888824).

The spelling of 21435412 in words is "twenty-one million, four hundred thirty-five thousand, four hundred twelve".