215213221045 has 4 divisors (see below), whose sum is σ = 258255865260. Its totient is φ = 172170576832.

The previous prime is 215213221033. The next prime is 215213221061. The reversal of 215213221045 is 540122312512.

It is a happy number.

215213221045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41031363844 + 174181857201 = 202562^2 + 417351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215213221045 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21521322100 + ... + 21521322109.

It is an arithmetic number, because the mean of its divisors is an integer number (64563966315).

Almost surely, 2^215213221045 is an apocalyptic number.

It is an amenable number.

215213221045 is a deficient number, since it is larger than the sum of its proper divisors (43042644215).

215213221045 is an equidigital number, since it uses as much as digits as its factorization.

215213221045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43042644214.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 215213221045 its reverse (540122312512), we get a palindrome (755335533557).

The spelling of 215213221045 in words is "two hundred fifteen billion, two hundred thirteen million, two hundred twenty-one thousand, forty-five".