21063315 has 48 divisors (see below), whose sum is σ = 41741568. Its totient is φ = 8880768.

The previous prime is 21063311. The next prime is 21063373. The reversal of 21063315 is 51336012.

It is not a de Polignac number, because 21063315 - 2² = 21063311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21063291 and 21063300.

It is not an unprimeable number, because it can be changed into a prime (21063311) 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 47 ways as a sum of consecutive naturals, for example, 17152 + ... + 18338.

It is an arithmetic number, because the mean of its divisors is an integer number (869616).

Almost surely, 2^21063315 is an apocalyptic number.

21063315 is a deficient number, since it is larger than the sum of its proper divisors (20678253).

21063315 is a wasteful number, since it uses less digits than its factorization.

21063315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228 (or 1215 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21063315 is about 4589.4787285704. The cubic root of 21063315 is about 276.1694113254.

Adding to 21063315 its reverse (51336012), we get a palindrome (72399327).

The spelling of 21063315 in words is "twenty-one million, sixty-three thousand, three hundred fifteen".