211521164 has 12 divisors (see below), whose sum is σ = 370354488. Its totient is φ = 105705600.

The previous prime is 211521161. The next prime is 211521187. The reversal of 211521164 is 461125112.

211521164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (211521161) 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, 4382 + ... + 21029.

It is an arithmetic number, because the mean of its divisors is an integer number (30862874).

Almost surely, 2^211521164 is an apocalyptic number.

It is an amenable number.

211521164 is a deficient number, since it is larger than the sum of its proper divisors (158833324).

211521164 is a wasteful number, since it uses less digits than its factorization.

211521164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27496 (or 27494 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 211521164 is about 14543.7671873556. The cubic root of 211521164 is about 595.8239311452.

Adding to 211521164 its reverse (461125112), we get a palindrome (672646276).

The spelling of 211521164 in words is "two hundred eleven million, five hundred twenty-one thousand, one hundred sixty-four".