212415500 has 72 divisors (see below), whose sum is σ = 510068832. Its totient is φ = 77220000.

The previous prime is 212415433. The next prime is 212415521. The reversal of 212415500 is 5514212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58745 + ... + 62255.

Almost surely, 2^212415500 is an apocalyptic number.

212415500 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 212415500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255034416).

212415500 is an abundant number, since it is smaller than the sum of its proper divisors (297653332).

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

212415500 is a wasteful number, since it uses less digits than its factorization.

212415500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3552 (or 3529 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212415500 is about 14574.4811228393. The cubic root of 212415500 is about 596.6624879635.

Adding to 212415500 its reverse (5514212), we get a palindrome (217929712).

The spelling of 212415500 in words is "two hundred twelve million, four hundred fifteen thousand, five hundred".