21232010 has 16 divisors (see below), whose sum is σ = 38576736. Its totient is φ = 8413008.

The previous prime is 21232007. The next prime is 21232033. The reversal of 21232010 is 1023212.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21231982 and 21232000.

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, 8852 + ... + 10991.

It is an arithmetic number, because the mean of its divisors is an integer number (2411046).

Almost surely, 2^21232010 is an apocalyptic number.

21232010 is a deficient number, since it is larger than the sum of its proper divisors (17344726).

21232010 is a wasteful number, since it uses less digits than its factorization.

21232010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19957.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21232010 is about 4607.8205260188. The cubic root of 21232010 is about 276.9047272781.

Adding to 21232010 its reverse (1023212), we get a palindrome (22255222).

The spelling of 21232010 in words is "twenty-one million, two hundred thirty-two thousand, ten".