215284212 has 288 divisors, whose sum is σ = 704471040. Its totient is φ = 54432000.

The previous prime is 215284171. The next prime is 215284229. The reversal of 215284212 is 212482512.

215284212 is a `hidden beast` number, since 215 + 28 + 421 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3032137 + ... + 3032207.

It is an arithmetic number, because the mean of its divisors is an integer number (2446080).

Almost surely, 2^215284212 is an apocalyptic number.

215284212 is a gapful number since it is divisible by the number (22) 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 215284212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352235520).

215284212 is an abundant number, since it is smaller than the sum of its proper divisors (489186828).

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

215284212 is a wasteful number, since it uses less digits than its factorization.

215284212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 150 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 215284212 is about 14672.5666466368. The cubic root of 215284212 is about 599.3364998831.

It can be divided in two parts, 215284 and 212, that added together give a triangular number (215496 = T₆₅₆).

The spelling of 215284212 in words is "two hundred fifteen million, two hundred eighty-four thousand, two hundred twelve".