21252310 has 16 divisors (see below), whose sum is σ = 38685600. Its totient is φ = 8405056.

The previous prime is 21252293. The next prime is 21252323. The reversal of 21252310 is 1325212.

It is a super-2 number, since 2×21252310² = 903321360672200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11050 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (2417850).

Almost surely, 2^21252310 is an apocalyptic number.

21252310 is a deficient number, since it is larger than the sum of its proper divisors (17433290).

21252310 is a wasteful number, since it uses less digits than its factorization.

21252310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23975.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21252310 is about 4610.0227765164. The cubic root of 21252310 is about 276.9929490314.

Adding to 21252310 its reverse (1325212), we get a palindrome (22577522).

The spelling of 21252310 in words is "twenty-one million, two hundred fifty-two thousand, three hundred ten".