21063244 has 12 divisors (see below), whose sum is σ = 36895824. Its totient is φ = 10521584.

The previous prime is 21063233. The next prime is 21063253. The reversal of 21063244 is 44236012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4209 + ... + 7735.

It is an arithmetic number, because the mean of its divisors is an integer number (3074652).

Almost surely, 2^21063244 is an apocalyptic number.

It is an amenable number.

21063244 is a deficient number, since it is larger than the sum of its proper divisors (15832580).

21063244 is a wasteful number, since it uses less digits than its factorization.

21063244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024 (or 5022 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21063244 is about 4589.4709934806. The cubic root of 21063244 is about 276.1691010221.

Adding to 21063244 its reverse (44236012), we get a palindrome (65299256).

The spelling of 21063244 in words is "twenty-one million, sixty-three thousand, two hundred forty-four".