21450412 has 12 divisors (see below), whose sum is σ = 37578856. Its totient is φ = 10713600.

The previous prime is 21450389. The next prime is 21450431. The reversal of 21450412 is 21405412.

It is a self number, because there is not a number n which added to its sum of digits gives 21450412.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2287 + ... + 6937.

Almost surely, 2^21450412 is an apocalyptic number.

It is an amenable number.

21450412 is a deficient number, since it is larger than the sum of its proper divisors (16128444).

21450412 is a wasteful number, since it uses less digits than its factorization.

21450412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5808 (or 5806 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21450412 is about 4631.4589494024. The cubic root of 21450412 is about 277.8509457507.

Adding to 21450412 its reverse (21405412), we get a palindrome (42855824).

The spelling of 21450412 in words is "twenty-one million, four hundred fifty thousand, four hundred twelve".