10635721 has 8 divisors (see below), whose sum is σ = 11086920. Its totient is φ = 10190208.

The previous prime is 10635719. The next prime is 10635733. The reversal of 10635721 is 12753601.

It can be written as a sum of positive squares in 4 ways, for example, as 164025 + 10471696 = 405^2 + 3236^2 .

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 10635721 - 2¹ = 10635719 is a prime.

It is a super-2 number, since 2×10635721² = 226237122379682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10635701) 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, 2635 + ... + 5311.

It is an arithmetic number, because the mean of its divisors is an integer number (1385865).

Almost surely, 2^10635721 is an apocalyptic number.

It is an amenable number.

10635721 is a deficient number, since it is larger than the sum of its proper divisors (451199).

10635721 is a wasteful number, since it uses less digits than its factorization.

10635721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2843.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 10635721 is about 3261.2453142933. The cubic root of 10635721 is about 219.9154013570.

The spelling of 10635721 in words is "ten million, six hundred thirty-five thousand, seven hundred twenty-one".