21704050 has 12 divisors (see below), whose sum is σ = 40369626. Its totient is φ = 8681600.

The previous prime is 21704029. The next prime is 21704069. The reversal of 21704050 is 5040712.

It can be written as a sum of positive squares in 3 ways, for example, as 14311089 + 7392961 = 3783^2 + 2719^2 .

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 5 ways as a sum of consecutive naturals, for example, 216991 + ... + 217090.

Almost surely, 2^21704050 is an apocalyptic number.

21704050 is a deficient number, since it is larger than the sum of its proper divisors (18665576).

21704050 is a wasteful number, since it uses less digits than its factorization.

21704050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434093 (or 434088 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21704050 is about 4658.7605647854. The cubic root of 21704050 is about 278.9417965885.

Adding to 21704050 its reverse (5040712), we get a palindrome (26744762).

The spelling of 21704050 in words is "twenty-one million, seven hundred four thousand, fifty".