215321012 has 24 divisors (see below), whose sum is σ = 387406152. Its totient is φ = 104652800.

The previous prime is 215321003. The next prime is 215321047. The reversal of 215321012 is 210123512.

It is a happy number.

215321012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 56460196 + 158860816 = 7514^2 + 12604^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45812 + ... + 50292.

It is an arithmetic number, because the mean of its divisors is an integer number (16141923).

Almost surely, 2^215321012 is an apocalyptic number.

It is an amenable number.

215321012 is a deficient number, since it is larger than the sum of its proper divisors (172085140).

215321012 is a wasteful number, since it uses less digits than its factorization.

215321012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4819 (or 4817 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 215321012 is about 14673.8206340407. The cubic root of 215321012 is about 599.3706474973.

Adding to 215321012 its reverse (210123512), we get a palindrome (425444524).

The spelling of 215321012 in words is "two hundred fifteen million, three hundred twenty-one thousand, twelve".