10222721 has 4 divisors (see below), whose sum is σ = 10233600. Its totient is φ = 10211844.

The previous prime is 10222717. The next prime is 10222757. The reversal of 10222721 is 12722201.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12722201 = 2719 ⋅4679.

It is a cyclic number.

It is not a de Polignac number, because 10222721 - 2² = 10222717 is a prime.

It is a super-3 number, since 3×10222721³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10222721.

It is not an unprimeable number, because it can be changed into a prime (10222711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3881 + ... + 5958.

It is an arithmetic number, because the mean of its divisors is an integer number (2558400).

Almost surely, 2^10222721 is an apocalyptic number.

It is an amenable number.

10222721 is a deficient number, since it is larger than the sum of its proper divisors (10879).

10222721 is an equidigital number, since it uses as much as digits as its factorization.

10222721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10878.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 10222721 is about 3197.2990163574. The cubic root of 10222721 is about 217.0311988384.

Adding to 10222721 its reverse (12722201), we get a palindrome (22944922).

The spelling of 10222721 in words is "ten million, two hundred twenty-two thousand, seven hundred twenty-one".