21252346 has 16 divisors (see below), whose sum is σ = 33917184. Its totient is φ = 9952704.

The previous prime is 21252337. The next prime is 21252347. The reversal of 21252346 is 64325212.

It is a self number, because there is not a number n which added to its sum of digits gives 21252346.

It is not an unprimeable number, because it can be changed into a prime (21252347) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6181 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (2119824).

Almost surely, 2^21252346 is an apocalyptic number.

21252346 is a deficient number, since it is larger than the sum of its proper divisors (12664838).

21252346 is a wasteful number, since it uses less digits than its factorization.

21252346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045.

The product of its digits is 2880, while the sum is 25.

The square root of 21252346 is about 4610.0266810508. The cubic root of 21252346 is about 276.9931054338.

Adding to 21252346 its reverse (64325212), we get a palindrome (85577558).

The spelling of 21252346 in words is "twenty-one million, two hundred fifty-two thousand, three hundred forty-six".