21793424 has 10 divisors (see below), whose sum is σ = 42224790. Its totient is φ = 10896704.

The previous prime is 21793363. The next prime is 21793451. The reversal of 21793424 is 42439712.

It can be written as a sum of positive squares in only one way, i.e., 20539024 + 1254400 = 4532^2 + 1120^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681029 + ... + 681060.

It is an arithmetic number, because the mean of its divisors is an integer number (4222479).

Almost surely, 2^21793424 is an apocalyptic number.

It is an amenable number.

21793424 is a deficient number, since it is larger than the sum of its proper divisors (20431366).

21793424 is a wasteful number, since it uses less digits than its factorization.

21793424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362097 (or 1362091 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 21793424 is about 4668.3427466286. The cubic root of 21793424 is about 279.3241523036.

The spelling of 21793424 in words is "twenty-one million, seven hundred ninety-three thousand, four hundred twenty-four".