211910971 has 12 divisors (see below), whose sum is σ = 225408744. Its totient is φ = 199180800.

The previous prime is 211910969. The next prime is 211910977. The reversal of 211910971 is 179019112.

It is a happy number.

It is not a de Polignac number, because 211910971 - 2¹ = 211910969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211910977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45051 + ... + 49531.

It is an arithmetic number, because the mean of its divisors is an integer number (18784062).

Almost surely, 2^211910971 is an apocalyptic number.

211910971 is a deficient number, since it is larger than the sum of its proper divisors (13497773).

211910971 is a wasteful number, since it uses less digits than its factorization.

211910971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650 (or 4631 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 31.

The square root of 211910971 is about 14557.1621891082. The cubic root of 211910971 is about 596.1897161531.

The spelling of 211910971 in words is "two hundred eleven million, nine hundred ten thousand, nine hundred seventy-one".