21164050 has 12 divisors (see below), whose sum is σ = 39365226. Its totient is φ = 8465600.

The previous prime is 21164047. The next prime is 21164051. The reversal of 21164050 is 5046112.

It can be written as a sum of positive squares in 3 ways, for example, as 10556001 + 10608049 = 3249^2 + 3257^2 .

It is not an unprimeable number, because it can be changed into a prime (21164051) 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, 211591 + ... + 211690.

Almost surely, 2^21164050 is an apocalyptic number.

21164050 is a deficient number, since it is larger than the sum of its proper divisors (18201176).

21164050 is a wasteful number, since it uses less digits than its factorization.

21164050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423293 (or 423288 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21164050 is about 4600.4401963290. The cubic root of 21164050 is about 276.6089700819.

It can be divided in two parts, 211 and 64050, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 21164050 in words is "twenty-one million, one hundred sixty-four thousand, fifty".