10635821 has 16 divisors (see below), whose sum is σ = 13099008. Its totient is φ = 8434800.

The previous prime is 10635817. The next prime is 10635827. The reversal of 10635821 is 12853601.

It is a cyclic number.

It is not a de Polignac number, because 10635821 - 2² = 10635817 is a prime.

It is a super-2 number, since 2×10635821² = 226241376688082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10635827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3926 + ... + 6056.

It is an arithmetic number, because the mean of its divisors is an integer number (818688).

Almost surely, 2^10635821 is an apocalyptic number.

It is an amenable number.

10635821 is a deficient number, since it is larger than the sum of its proper divisors (2463187).

10635821 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (10635820) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (2192).

10635821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 10635821 is about 3261.2606458239. The cubic root of 10635821 is about 219.9160905900.

The spelling of 10635821 in words is "ten million, six hundred thirty-five thousand, eight hundred twenty-one".