213015811 has 4 divisors (see below), whose sum is σ = 222277392. Its totient is φ = 203754232.

The previous prime is 213015809. The next prime is 213015827. The reversal of 213015811 is 118510312.

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 213015811 - 2¹ = 213015809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213015841) 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 3 ways as a sum of consecutive naturals, for example, 4630756 + ... + 4630801.

It is an arithmetic number, because the mean of its divisors is an integer number (55569348).

Almost surely, 2^213015811 is an apocalyptic number.

213015811 is a deficient number, since it is larger than the sum of its proper divisors (9261581).

213015811 is an equidigital number, since it uses as much as digits as its factorization.

213015811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9261580.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 213015811 is about 14595.0611852092. The cubic root of 213015811 is about 597.2240385742.

The spelling of 213015811 in words is "two hundred thirteen million, fifteen thousand, eight hundred eleven".