215011215 has 12 divisors (see below), whose sum is σ = 372686184. Its totient is φ = 114672624.

The previous prime is 215011211. The next prime is 215011261. The reversal of 215011215 is 512110512.

It is not a de Polignac number, because 215011215 - 2² = 215011211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215011211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2388969 + ... + 2389058.

It is an arithmetic number, because the mean of its divisors is an integer number (31057182).

Almost surely, 2^215011215 is an apocalyptic number.

215011215 is a deficient number, since it is larger than the sum of its proper divisors (157674969).

215011215 is a wasteful number, since it uses less digits than its factorization.

215011215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778038 (or 4778035 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 215011215 is about 14663.2607219540. The cubic root of 215011215 is about 599.0830577420.

Adding to 215011215 its reverse (512110512), we get a palindrome (727121727).

The spelling of 215011215 in words is "two hundred fifteen million, eleven thousand, two hundred fifteen".