21536230 has 16 divisors (see below), whose sum is σ = 39150864. Its totient is φ = 8528800.

The previous prime is 21536213. The next prime is 21536261. The reversal of 21536230 is 3263512.

It is a super-2 number, since 2×21536230² = 927618405225800, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9652 + ... + 11671.

It is an arithmetic number, because the mean of its divisors is an integer number (2446929).

Almost surely, 2^21536230 is an apocalyptic number.

21536230 is a deficient number, since it is larger than the sum of its proper divisors (17614634).

21536230 is a wasteful number, since it uses less digits than its factorization.

21536230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21431.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21536230 is about 4640.7143846611. The cubic root of 21536230 is about 278.2209912317.

Adding to 21536230 its reverse (3263512), we get a palindrome (24799742).

The spelling of 21536230 in words is "twenty-one million, five hundred thirty-six thousand, two hundred thirty".