213123151 has 4 divisors (see below), whose sum is σ = 213157512. Its totient is φ = 213088792.

The previous prime is 213123149. The next prime is 213123187. The reversal of 213123151 is 151321312.

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 213123151 - 2¹ = 213123149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4996 + ... + 21241.

It is an arithmetic number, because the mean of its divisors is an integer number (53289378).

Almost surely, 2^213123151 is an apocalyptic number.

213123151 is a deficient number, since it is larger than the sum of its proper divisors (34361).

213123151 is an equidigital number, since it uses as much as digits as its factorization.

213123151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34360.

The product of its digits is 180, while the sum is 19.

The square root of 213123151 is about 14598.7379934020. The cubic root of 213123151 is about 597.3243367058.

Adding to 213123151 its reverse (151321312), we get a palindrome (364444463).

The spelling of 213123151 in words is "two hundred thirteen million, one hundred twenty-three thousand, one hundred fifty-one".