21010633 has 8 divisors (see below), whose sum is σ = 24043968. Its totient is φ = 17985264.

The previous prime is 21010609. The next prime is 21010663. The reversal of 21010633 is 33601012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010633 - 2⁵ = 21010601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010663) 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, 5610 + ... + 8572.

It is an arithmetic number, because the mean of its divisors is an integer number (3005496).

Almost surely, 2^21010633 is an apocalyptic number.

It is an amenable number.

21010633 is a deficient number, since it is larger than the sum of its proper divisors (3033335).

21010633 is a wasteful number, since it uses less digits than its factorization.

21010633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21010633 is about 4583.7357035501. The cubic root of 21010633 is about 275.9389742904.

Adding to 21010633 its reverse (33601012), we get a palindrome (54611645).

The spelling of 21010633 in words is "twenty-one million, ten thousand, six hundred thirty-three".