211211197 has 4 divisors (see below), whose sum is σ = 211242816. Its totient is φ = 211179580.

The previous prime is 211211191. The next prime is 211211243. The reversal of 211211197 is 791112112.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211211197 is a prime.

It is a super-2 number, since 2×211211197² = 89220339476345618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429 + ... + 20602.

It is an arithmetic number, because the mean of its divisors is an integer number (52810704).

Almost surely, 2^211211197 is an apocalyptic number.

It is an amenable number.

211211197 is a deficient number, since it is larger than the sum of its proper divisors (31619).

211211197 is an equidigital number, since it uses as much as digits as its factorization.

211211197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31618.

The product of its digits is 252, while the sum is 25.

The square root of 211211197 is about 14533.1069286646. The cubic root of 211211197 is about 595.5327450838.

The spelling of 211211197 in words is "two hundred eleven million, two hundred eleven thousand, one hundred ninety-seven".