215212045 has 8 divisors (see below), whose sum is σ = 267159960. Its totient is φ = 166232640.

The previous prime is 215212043. The next prime is 215212073. The reversal of 215212045 is 540212512.

It can be written as a sum of positive squares in 4 ways, for example, as 51423241 + 163788804 = 7171^2 + 12798^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215212045 - 2¹ = 215212043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215212043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741966 + ... + 742255.

It is an arithmetic number, because the mean of its divisors is an integer number (33394995).

Almost surely, 2^215212045 is an apocalyptic number.

It is an amenable number.

215212045 is a deficient number, since it is larger than the sum of its proper divisors (51947915).

215212045 is a wasteful number, since it uses less digits than its factorization.

215212045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484255.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 215212045 is about 14670.1071911558. The cubic root of 215212045 is about 599.2695230704.

Adding to 215212045 its reverse (540212512), we get a palindrome (755424557).

The spelling of 215212045 in words is "two hundred fifteen million, two hundred twelve thousand, forty-five".