21671792 has 10 divisors (see below), whose sum is σ = 41989128. Its totient is φ = 10835888.

The previous prime is 21671791. The next prime is 21671801. The reversal of 21671792 is 29717612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21671791) by changing a digit.

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 as a sum of consecutive naturals, namely, 677228 + ... + 677259.

Almost surely, 2^21671792 is an apocalyptic number.

It is an amenable number.

21671792 is a deficient number, since it is larger than the sum of its proper divisors (20317336).

21671792 is a wasteful number, since it uses less digits than its factorization.

21671792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354495 (or 1354489 counting only the distinct ones).

The product of its digits is 10584, while the sum is 35.

The square root of 21671792 is about 4655.2971978167. The cubic root of 21671792 is about 278.8035341288.

The spelling of 21671792 in words is "twenty-one million, six hundred seventy-one thousand, seven hundred ninety-two".