21068372 has 24 divisors (see below), whose sum is σ = 42043176. Its totient is φ = 9151488.

The previous prime is 21068357. The next prime is 21068417. The reversal of 21068372 is 27386012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5982916 + 15085456 = 2446^2 + 3884^2 .

It is a congruent number.

It is an unprimeable number.

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, 11033 + ... + 12800.

It is an arithmetic number, because the mean of its divisors is an integer number (1751799).

Almost surely, 2^21068372 is an apocalyptic number.

It is an amenable number.

21068372 is a deficient number, since it is larger than the sum of its proper divisors (20974804).

21068372 is a wasteful number, since it uses less digits than its factorization.

21068372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23867 (or 23865 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21068372 is about 4590.0296295340. The cubic root of 21068372 is about 276.1915109959.

The spelling of 21068372 in words is "twenty-one million, sixty-eight thousand, three hundred seventy-two".