21010963 has 8 divisors (see below), whose sum is σ = 22965120. Its totient is φ = 19136640.

The previous prime is 21010943. The next prime is 21010967. The reversal of 21010963 is 36901012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010963 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010967) 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, 19408 + ... + 20461.

It is an arithmetic number, because the mean of its divisors is an integer number (2870640).

Almost surely, 2^21010963 is an apocalyptic number.

21010963 is a deficient number, since it is larger than the sum of its proper divisors (1954157).

21010963 is a wasteful number, since it uses less digits than its factorization.

21010963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39917.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 21010963 is about 4583.7717002486. The cubic root of 21010963 is about 275.9404189460.

Adding to 21010963 its reverse (36901012), we get a palindrome (57911975).

The spelling of 21010963 in words is "twenty-one million, ten thousand, nine hundred sixty-three".