21349850 has 12 divisors (see below), whose sum is σ = 39710814. Its totient is φ = 8539920.

The previous prime is 21349849. The next prime is 21349859. The reversal of 21349850 is 5894312.

It can be written as a sum of positive squares in 3 ways, for example, as 11992369 + 9357481 = 3463^2 + 3059^2 .

It is not an unprimeable number, because it can be changed into a prime (21349859) 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 in 5 ways as a sum of consecutive naturals, for example, 213449 + ... + 213548.

Almost surely, 2^21349850 is an apocalyptic number.

21349850 is a deficient number, since it is larger than the sum of its proper divisors (18360964).

21349850 is a wasteful number, since it uses less digits than its factorization.

21349850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427009 (or 427004 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 21349850 is about 4620.5897891936. The cubic root of 21349850 is about 277.4160663831.

The spelling of 21349850 in words is "twenty-one million, three hundred forty-nine thousand, eight hundred fifty".