10647721 has 4 divisors (see below), whose sum is σ = 12168832. Its totient is φ = 9126612.

The previous prime is 10647719. The next prime is 10647731. The reversal of 10647721 is 12774601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12774601 = 7 ⋅1824943.

It is a cyclic number.

It is not a de Polignac number, because 10647721 - 2¹ = 10647719 is a prime.

It is a super-2 number, since 2×10647721² = 226747924987682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10647721.

It is not an unprimeable number, because it can be changed into a prime (10647701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760545 + ... + 760558.

It is an arithmetic number, because the mean of its divisors is an integer number (3042208).

Almost surely, 2^10647721 is an apocalyptic number.

It is an amenable number.

10647721 is a deficient number, since it is larger than the sum of its proper divisors (1521111).

10647721 is an equidigital number, since it uses as much as digits as its factorization.

10647721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521110.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 10647721 is about 3263.0845836417. The cubic root of 10647721 is about 219.9980784956.

The spelling of 10647721 in words is "ten million, six hundred forty-seven thousand, seven hundred twenty-one".