10663721 has 8 divisors (see below), whose sum is σ = 11071488. Its totient is φ = 10260000.

The previous prime is 10663717. The next prime is 10663739. The reversal of 10663721 is 12736601.

10663721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10663721 - 2² = 10663717 is a prime.

It is a super-2 number, since 2×10663721² = 227429891131682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10662721) 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, 5021 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (1383936).

Almost surely, 2^10663721 is an apocalyptic number.

It is an amenable number.

10663721 is a deficient number, since it is larger than the sum of its proper divisors (407767).

10663721 is a wasteful number, since it uses less digits than its factorization.

10663721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 10663721 is about 3265.5353313048. The cubic root of 10663721 is about 220.1082181086.

The spelling of 10663721 in words is "ten million, six hundred sixty-three thousand, seven hundred twenty-one".