211530204 has 30 divisors (see below), whose sum is σ = 552982584. Its totient is φ = 70509960.

The previous prime is 211530203. The next prime is 211530217. The reversal of 211530204 is 402035112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211530203) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 326112 + ... + 326759.

Almost surely, 2^211530204 is an apocalyptic number.

It is an amenable number.

211530204 is an abundant number, since it is smaller than the sum of its proper divisors (341452380).

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

211530204 is a wasteful number, since it uses less digits than its factorization.

211530204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652887 (or 652876 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 211530204 is about 14544.0779700880. The cubic root of 211530204 is about 595.8324191400.

Adding to 211530204 its reverse (402035112), we get a palindrome (613565316).

The spelling of 211530204 in words is "two hundred eleven million, five hundred thirty thousand, two hundred four".