211131664 has 20 divisors (see below), whose sum is σ = 411012880. Its totient is φ = 105063840.

The previous prime is 211131649. The next prime is 211131703. The reversal of 211131664 is 466131112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27894 + ... + 34645.

It is an arithmetic number, because the mean of its divisors is an integer number (20550644).

Almost surely, 2^211131664 is an apocalyptic number.

It is an amenable number.

211131664 is a deficient number, since it is larger than the sum of its proper divisors (199881216).

211131664 is a wasteful number, since it uses less digits than its factorization.

211131664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62758 (or 62752 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 211131664 is about 14530.3704013353. The cubic root of 211131664 is about 595.4579850760.

Adding to 211131664 its reverse (466131112), we get a palindrome (677262776).

The spelling of 211131664 in words is "two hundred eleven million, one hundred thirty-one thousand, six hundred sixty-four".