21533050 has 144 divisors (see below), whose sum is σ = 54960768. Its totient is φ = 6182400.

The previous prime is 21533047. The next prime is 21533111. The reversal of 21533050 is 5033512.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 458127 + ... + 458173.

It is an arithmetic number, because the mean of its divisors is an integer number (381672).

Almost surely, 2^21533050 is an apocalyptic number.

21533050 is an abundant number, since it is smaller than the sum of its proper divisors (33427718).

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

21533050 is a wasteful number, since it uses less digits than its factorization.

21533050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 21533050 is about 4640.3717523492. The cubic root of 21533050 is about 278.2072966915.

Adding to 21533050 its reverse (5033512), we get a palindrome (26566562).

The spelling of 21533050 in words is "twenty-one million, five hundred thirty-three thousand, fifty".