213123538 has 8 divisors (see below), whose sum is σ = 320694732. Its totient is φ = 106225296.

The previous prime is 213123511. The next prime is 213123539. The reversal of 213123538 is 835321312.

It can be written as a sum of positive squares in 2 ways, for example, as 206295769 + 6827769 = 14363^2 + 2613^2 .

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

It is not an unprimeable number, because it can be changed into a prime (213123539) 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, 167445 + ... + 168712.

Almost surely, 2^213123538 is an apocalyptic number.

213123538 is a deficient number, since it is larger than the sum of its proper divisors (107571194).

213123538 is a wasteful number, since it uses less digits than its factorization.

213123538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336476.

The product of its digits is 4320, while the sum is 28.

The square root of 213123538 is about 14598.7512479664. The cubic root of 213123538 is about 597.3246982563.

The spelling of 213123538 in words is "two hundred thirteen million, one hundred twenty-three thousand, five hundred thirty-eight".