216231100 has 36 divisors (see below), whose sum is σ = 471719808. Its totient is φ = 86032000.

The previous prime is 216231083. The next prime is 216231121. The reversal of 216231100 is 1132612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13440 + ... + 24760.

It is an arithmetic number, because the mean of its divisors is an integer number (13103328).

Almost surely, 2^216231100 is an apocalyptic number.

216231100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216231100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235859904).

216231100 is an abundant number, since it is smaller than the sum of its proper divisors (255488708).

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

216231100 is a wasteful number, since it uses less digits than its factorization.

216231100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11526 (or 11519 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 216231100 is about 14704.7985365322. The cubic root of 216231100 is about 600.2139052134.

Adding to 216231100 its reverse (1132612), we get a palindrome (217363712).

The spelling of 216231100 in words is "two hundred sixteen million, two hundred thirty-one thousand, one hundred".