20197211 has 2 divisors, whose sum is σ = 20197212. Its totient is φ = 20197210.

The previous prime is 20197201. The next prime is 20197237. The reversal of 20197211 is 11279102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20197211 is a prime.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is not a weakly prime, because it can be changed into another prime (20197201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10098605 + 10098606.

It is an arithmetic number, because the mean of its divisors is an integer number (10098606).

Almost surely, 2^20197211 is an apocalyptic number.

20197211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20197211 is an equidigital number, since it uses as much as digits as its factorization.

20197211 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 23.

The square root of 20197211 is about 4494.1307279606. The cubic root of 20197211 is about 272.3310334841.

The spelling of 20197211 in words is "twenty million, one hundred ninety-seven thousand, two hundred eleven".