211996197 has 60 divisors (see below), whose sum is σ = 380493696. Its totient is φ = 117164880.

The previous prime is 211996163. The next prime is 211996219. The reversal of 211996197 is 791699112.

211996197 is a `hidden beast` number, since 21 + 1 + 9 + 9 + 619 + 7 = 666.

It is not a de Polignac number, because 211996197 - 2¹⁸ = 211734053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211996097) 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 59 ways as a sum of consecutive naturals, for example, 122178 + ... + 123900.

Almost surely, 2^211996197 is an apocalyptic number.

211996197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

211996197 is a deficient number, since it is larger than the sum of its proper divisors (168497499).

211996197 is a wasteful number, since it uses less digits than its factorization.

211996197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780 (or 1764 counting only the distinct ones).

The product of its digits is 61236, while the sum is 45.

The square root of 211996197 is about 14560.0891824192. The cubic root of 211996197 is about 596.2696303018.

The spelling of 211996197 in words is "two hundred eleven million, nine hundred ninety-six thousand, one hundred ninety-seven".