211212664 has 64 divisors (see below), whose sum is σ = 454356000. Its totient is φ = 91238400.

The previous prime is 211212653. The next prime is 211212667. The reversal of 211212664 is 466212112.

It is a happy number.

It is a super-2 number, since 2×211212664² = 89221578867953792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175264 + ... + 176464.

Almost surely, 2^211212664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211212664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227178000).

211212664 is an abundant number, since it is smaller than the sum of its proper divisors (243143336).

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

211212664 is a wasteful number, since it uses less digits than its factorization.

211212664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1324 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 211212664 is about 14533.1573995467. The cubic root of 211212664 is about 595.5341238688.

Adding to 211212664 its reverse (466212112), we get a palindrome (677424776).

The spelling of 211212664 in words is "two hundred eleven million, two hundred twelve thousand, six hundred sixty-four".