211281764 has 12 divisors (see below), whose sum is σ = 370132224. Its totient is φ = 105529704.

The previous prime is 211281761. The next prime is 211281769. The reversal of 211281764 is 467182112.

It is a happy number.

211281764 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 211281764.

It is not an unprimeable number, because it can be changed into a prime (211281761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23444 + ... + 31179.

It is an arithmetic number, because the mean of its divisors is an integer number (30844352).

Almost surely, 2^211281764 is an apocalyptic number.

It is an amenable number.

211281764 is a deficient number, since it is larger than the sum of its proper divisors (158850460).

211281764 is a wasteful number, since it uses less digits than its factorization.

211281764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55594 (or 55592 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 211281764 is about 14535.5345274950. The cubic root of 211281764 is about 595.5990614540.

The spelling of 211281764 in words is "two hundred eleven million, two hundred eighty-one thousand, seven hundred sixty-four".