21156050 has 12 divisors (see below), whose sum is σ = 39350346. Its totient is φ = 8462400.

The previous prime is 21156049. The next prime is 21156053. The reversal of 21156050 is 5065112.

It can be written as a sum of positive squares in 3 ways, for example, as 8532241 + 12623809 = 2921^2 + 3553^2 .

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21156053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211511 + ... + 211610.

Almost surely, 2^21156050 is an apocalyptic number.

21156050 is a deficient number, since it is larger than the sum of its proper divisors (18194296).

21156050 is a wasteful number, since it uses less digits than its factorization.

21156050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423133 (or 423128 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 21156050 is about 4599.5706321351. The cubic root of 21156050 is about 276.5741130068.

The spelling of 21156050 in words is "twenty-one million, one hundred fifty-six thousand, fifty".