21173050 has 12 divisors (see below), whose sum is σ = 39381966. Its totient is φ = 8469200.

The previous prime is 21173029. The next prime is 21173057. The reversal of 21173050 is 5037112.

It can be written as a sum of positive squares in 3 ways, for example, as 20421361 + 751689 = 4519^2 + 867^2 .

It is not an unprimeable number, because it can be changed into a prime (21173057) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 211681 + ... + 211780.

Almost surely, 2^21173050 is an apocalyptic number.

21173050 is a deficient number, since it is larger than the sum of its proper divisors (18208916).

21173050 is a wasteful number, since it uses less digits than its factorization.

21173050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423473 (or 423468 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 21173050 is about 4601.4182596239. The cubic root of 21173050 is about 276.6481737934.

The spelling of 21173050 in words is "twenty-one million, one hundred seventy-three thousand, fifty".