21163050 has 72 divisors (see below), whose sum is σ = 57451680. Its totient is φ = 5584800.

The previous prime is 21163033. The next prime is 21163057. The reversal of 21163050 is 5036112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21163057) 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 35 ways as a sum of consecutive naturals, for example, 58771 + ... + 59129.

It is an arithmetic number, because the mean of its divisors is an integer number (797940).

Almost surely, 2^21163050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21163050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28725840).

21163050 is an abundant number, since it is smaller than the sum of its proper divisors (36288630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21163050 is a wasteful number, since it uses less digits than its factorization.

21163050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 21163050 is about 4600.3315097936. The cubic root of 21163050 is about 276.6046134279.

Adding to 21163050 its reverse (5036112), we get a palindrome (26199162).

The spelling of 21163050 in words is "twenty-one million, one hundred sixty-three thousand, fifty".