215243100 has 108 divisors (see below), whose sum is σ = 677717040. Its totient is φ = 57139200.

The previous prime is 215243099. The next prime is 215243113. The reversal of 215243100 is 1342512.

215243100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215243100² = 92659184195220000, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 279516 + ... + 280284.

Almost surely, 2^215243100 is an apocalyptic number.

215243100 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 215243100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338858520).

215243100 is an abundant number, since it is smaller than the sum of its proper divisors (462473940).

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

215243100 is a wasteful number, since it uses less digits than its factorization.

215243100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 1090 counting only the distinct ones).

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

The square root of 215243100 is about 14671.1655978658. The cubic root of 215243100 is about 599.2983464570.

Adding to 215243100 its reverse (1342512), we get a palindrome (216585612).

The spelling of 215243100 in words is "two hundred fifteen million, two hundred forty-three thousand, one hundred".