10721663 has 4 divisors (see below), whose sum is σ = 10971048. Its totient is φ = 10472280.

The previous prime is 10721653. The next prime is 10721723. The reversal of 10721663 is 36612701.

10721663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10721663 is a prime.

It is a super-2 number, since 2×10721663² = 229908114971138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10721603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124628 + ... + 124713.

It is an arithmetic number, because the mean of its divisors is an integer number (2742762).

Almost surely, 2^10721663 is an apocalyptic number.

10721663 is a deficient number, since it is larger than the sum of its proper divisors (249385).

10721663 is an equidigital number, since it uses as much as digits as its factorization.

10721663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249384.

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

The square root of 10721663 is about 3274.3950586330. The cubic root of 10721663 is about 220.5061555280.

The spelling of 10721663 in words is "ten million, seven hundred twenty-one thousand, six hundred sixty-three".