10021997 has 4 divisors (see below), whose sum is σ = 10457760. Its totient is φ = 9586236.

The previous prime is 10021969. The next prime is 10022009. The reversal of 10021997 is 79912001.

10021997 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, 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: 79912001 = 13 ⋅6147077.

It is a cyclic number.

It is not a de Polignac number, because 10021997 - 2⁶ = 10021933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021597) 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, 217847 + ... + 217892.

It is an arithmetic number, because the mean of its divisors is an integer number (2614440).

Almost surely, 2^10021997 is an apocalyptic number.

It is an amenable number.

10021997 is a deficient number, since it is larger than the sum of its proper divisors (435763).

10021997 is an equidigital number, since it uses as much as digits as its factorization.

10021997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435762.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 10021997 is about 3165.7537806974. The cubic root of 10021997 is about 215.6013236483.

Adding to 10021997 its reverse (79912001), we get a palindrome (89933998).

The spelling of 10021997 in words is "ten million, twenty-one thousand, nine hundred ninety-seven".