211031216 has 40 divisors (see below), whose sum is σ = 446877648. Its totient is φ = 95744000.

The previous prime is 211031209. The next prime is 211031221. The reversal of 211031216 is 612130112.

It is a junction number, because it is equal to n+sod(n) for n = 211031194 and 211031203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154376 + ... + 155736.

Almost surely, 2^211031216 is an apocalyptic number.

It is an amenable number.

211031216 is an abundant number, since it is smaller than the sum of its proper divisors (235846432).

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

211031216 is a wasteful number, since it uses less digits than its factorization.

211031216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261 (or 2255 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 211031216 is about 14526.9135056281. The cubic root of 211031216 is about 595.3635383999.

Adding to 211031216 its reverse (612130112), we get a palindrome (823161328).

The spelling of 211031216 in words is "two hundred eleven million, thirty-one thousand, two hundred sixteen".