21230250 has 32 divisors (see below), whose sum is σ = 52992576. Its totient is φ = 5661200.

The previous prime is 21230249. The next prime is 21230273. The reversal of 21230250 is 5203212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13404 + ... + 14903.

It is an arithmetic number, because the mean of its divisors is an integer number (1656018).

Almost surely, 2^21230250 is an apocalyptic number.

21230250 is an abundant number, since it is smaller than the sum of its proper divisors (31762326).

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

21230250 is a wasteful number, since it uses less digits than its factorization.

21230250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28327 (or 28317 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 21230250 is about 4607.6295424003. The cubic root of 21230250 is about 276.8970758470.

Adding to 21230250 its reverse (5203212), we get a palindrome (26433462).

The spelling of 21230250 in words is "twenty-one million, two hundred thirty thousand, two hundred fifty".