215124012 has 72 divisors (see below), whose sum is σ = 577152576. Its totient is φ = 70026768.

The previous prime is 215124011. The next prime is 215124053. The reversal of 215124012 is 210421512.

It is a super-2 number, since 2×215124012² = 92556681077952288, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (215124011) by changing a digit.

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, 39223 + ... + 44369.

It is an arithmetic number, because the mean of its divisors is an integer number (8016008).

Almost surely, 2^215124012 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 215124012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288576288).

215124012 is an abundant number, since it is smaller than the sum of its proper divisors (362028564).

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

215124012 is a wasteful number, since it uses less digits than its factorization.

215124012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 215124012 is about 14667.1064631031. The cubic root of 215124012 is about 599.1878010509.

Adding to 215124012 its reverse (210421512), we get a palindrome (425545524).

The spelling of 215124012 in words is "two hundred fifteen million, one hundred twenty-four thousand, twelve".