20211097 has 2 divisors, whose sum is σ = 20211098. Its totient is φ = 20211096.

The previous prime is 20211077. The next prime is 20211109. The reversal of 20211097 is 79011202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19545241 + 665856 = 4421^2 + 816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105548 + 10105549.

It is an arithmetic number, because the mean of its divisors is an integer number (10105549).

Almost surely, 2^20211097 is an apocalyptic number.

It is an amenable number.

20211097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211097 is an equidigital number, since it uses as much as digits as its factorization.

20211097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20211097 is about 4495.6753663938. The cubic root of 20211097 is about 272.3934302579.

Adding to 20211097 its reverse (79011202), we get a palindrome (99222299).

The spelling of 20211097 in words is "twenty million, two hundred eleven thousand, ninety-seven".