21063513 has 8 divisors (see below), whose sum is σ = 28240576. Its totient is φ = 13964400.

The previous prime is 21063503. The next prime is 21063517. The reversal of 21063513 is 31536012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21063513 - 2⁵ = 21063481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21063513.

It is not an unprimeable number, because it can be changed into a prime (21063517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18853 + ... + 19938.

It is an arithmetic number, because the mean of its divisors is an integer number (3530072).

Almost surely, 2^21063513 is an apocalyptic number.

It is an amenable number.

21063513 is a deficient number, since it is larger than the sum of its proper divisors (7177063).

21063513 is a wasteful number, since it uses less digits than its factorization.

21063513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38975.

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

The square root of 21063513 is about 4589.5002995969. The cubic root of 21063513 is about 276.1702766747.

Adding to 21063513 its reverse (31536012), we get a palindrome (52599525).

The spelling of 21063513 in words is "twenty-one million, sixty-three thousand, five hundred thirteen".