215455212 has 144 divisors (see below), whose sum is σ = 693987840. Its totient is φ = 54867456.

The previous prime is 215455211. The next prime is 215455243. The reversal of 215455212 is 212554512.

It is not an unprimeable number, because it can be changed into a prime (215455211) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 80073 + ... + 82719.

It is an arithmetic number, because the mean of its divisors is an integer number (4819360).

Almost surely, 2^215455212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215455212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346993920).

215455212 is an abundant number, since it is smaller than the sum of its proper divisors (478532628).

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

215455212 is a wasteful number, since it uses less digits than its factorization.

215455212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700 (or 2695 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 215455212 is about 14678.3926912997. The cubic root of 215455212 is about 599.4951419831.

The spelling of 215455212 in words is "two hundred fifteen million, four hundred fifty-five thousand, two hundred twelve".