21450032 has 10 divisors (see below), whose sum is σ = 41559468. Its totient is φ = 10725008.

The previous prime is 21450029. The next prime is 21450061. The reversal of 21450032 is 23005412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670298 + ... + 670329.

Almost surely, 2^21450032 is an apocalyptic number.

It is an amenable number.

21450032 is a deficient number, since it is larger than the sum of its proper divisors (20109436).

21450032 is a wasteful number, since it uses less digits than its factorization.

21450032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340635 (or 1340629 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21450032 is about 4631.4179254306. The cubic root of 21450032 is about 277.8493050055.

Adding to 21450032 its reverse (23005412), we get a palindrome (44455444).

The spelling of 21450032 in words is "twenty-one million, four hundred fifty thousand, thirty-two".