10221997 has 4 divisors (see below), whose sum is σ = 10471356. Its totient is φ = 9972640.

The previous prime is 10221973. The next prime is 10222001. The reversal of 10221997 is 79912201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79912201 = 107 ⋅746843.

It can be written as a sum of positive squares in 2 ways, for example, as 3493161 + 6728836 = 1869^2 + 2594^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221997 - 2¹⁵ = 10189229 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221397) 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, 124618 + ... + 124699.

It is an arithmetic number, because the mean of its divisors is an integer number (2617839).

Almost surely, 2^10221997 is an apocalyptic number.

It is an amenable number.

10221997 is a deficient number, since it is larger than the sum of its proper divisors (249359).

10221997 is an equidigital number, since it uses as much as digits as its factorization.

10221997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249358.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 10221997 is about 3197.1857937880. The cubic root of 10221997 is about 217.0260751439.

The spelling of 10221997 in words is "ten million, two hundred twenty-one thousand, nine hundred ninety-seven".