211957146 has 24 divisors (see below), whose sum is σ = 467026560. Its totient is φ = 69454536.

The previous prime is 211957117. The next prime is 211957157. The reversal of 211957146 is 641759112.

It is a self number, because there is not a number n which added to its sum of digits gives 211957146.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 98730 + ... + 100853.

It is an arithmetic number, because the mean of its divisors is an integer number (19459440).

Almost surely, 2^211957146 is an apocalyptic number.

211957146 is an abundant number, since it is smaller than the sum of its proper divisors (255069414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211957146 is a wasteful number, since it uses less digits than its factorization.

211957146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199650 (or 199647 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 211957146 is about 14558.7480917832. The cubic root of 211957146 is about 596.2330158790.

The spelling of 211957146 in words is "two hundred eleven million, nine hundred fifty-seven thousand, one hundred forty-six".