213112015 has 4 divisors (see below), whose sum is σ = 255734424. Its totient is φ = 170489608.

The previous prime is 213111991. The next prime is 213112019. The reversal of 213112015 is 510211312.

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

It is a cyclic number.

It is not a de Polignac number, because 213112015 - 2²⁵ = 179557583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213112015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213112019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21311197 + ... + 21311206.

It is an arithmetic number, because the mean of its divisors is an integer number (63933606).

Almost surely, 2^213112015 is an apocalyptic number.

213112015 is a deficient number, since it is larger than the sum of its proper divisors (42622409).

213112015 is an equidigital number, since it uses as much as digits as its factorization.

213112015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42622408.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 213112015 is about 14598.3565855887. The cubic root of 213112015 is about 597.3139328311.

Adding to 213112015 its reverse (510211312), we get a palindrome (723323327).

The spelling of 213112015 in words is "two hundred thirteen million, one hundred twelve thousand, fifteen".