10221397 has 2 divisors, whose sum is σ = 10221398. Its totient is φ = 10221396.

The previous prime is 10221391. The next prime is 10221443. The reversal of 10221397 is 79312201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5731236 + 4490161 = 2394^2 + 2119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10221397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10221391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110698 + 5110699.

It is an arithmetic number, because the mean of its divisors is an integer number (5110699).

Almost surely, 2^10221397 is an apocalyptic number.

It is an amenable number.

10221397 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221397 is an equidigital number, since it uses as much as digits as its factorization.

10221397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 10221397 is about 3197.0919598911. The cubic root of 10221397 is about 217.0218288050.

Adding to 10221397 its reverse (79312201), we get a palindrome (89533598).

The spelling of 10221397 in words is "ten million, two hundred twenty-one thousand, three hundred ninety-seven".