211530870 has 48 divisors (see below), whose sum is σ = 551013840. Its totient is φ = 56302272.

The previous prime is 211530863. The next prime is 211530883. The reversal of 211530870 is 78035112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53812 + ... + 57608.

It is an arithmetic number, because the mean of its divisors is an integer number (11479455).

Almost surely, 2^211530870 is an apocalyptic number.

211530870 is an abundant number, since it is smaller than the sum of its proper divisors (339482970).

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

211530870 is a wasteful number, since it uses less digits than its factorization.

211530870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429 (or 4426 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 211530870 is about 14544.1008659869. The cubic root of 211530870 is about 595.8330444628.

Adding to 211530870 its reverse (78035112), we get a palindrome (289565982).

The spelling of 211530870 in words is "two hundred eleven million, five hundred thirty thousand, eight hundred seventy".