211420197 has 6 divisors (see below), whose sum is σ = 305384742. Its totient is φ = 140946792.

The previous prime is 211420171. The next prime is 211420199. The reversal of 211420197 is 791024112.

It can be written as a sum of positive squares in only one way, i.e., 197290116 + 14130081 = 14046^2 + 3759^2 .

It is not a de Polignac number, because 211420197 - 2⁸ = 211419941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211420197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211420199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11745558 + ... + 11745575.

It is an arithmetic number, because the mean of its divisors is an integer number (50897457).

Almost surely, 2^211420197 is an apocalyptic number.

It is an amenable number.

211420197 is a deficient number, since it is larger than the sum of its proper divisors (93964545).

211420197 is a wasteful number, since it uses less digits than its factorization.

211420197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23491139 (or 23491136 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 211420197 is about 14540.2956297319. The cubic root of 211420197 is about 595.7291130062.

The spelling of 211420197 in words is "two hundred eleven million, four hundred twenty thousand, one hundred ninety-seven".