213122138 has 8 divisors (see below), whose sum is σ = 320838132. Its totient is φ = 106176096.

The previous prime is 213122137. The next prime is 213122201. The reversal of 213122138 is 831221312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 213072409 + 49729 = 14597^2 + 223^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213122137) 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, 191795 + ... + 192902.

Almost surely, 2^213122138 is an apocalyptic number.

213122138 is a deficient number, since it is larger than the sum of its proper divisors (107715994).

213122138 is a wasteful number, since it uses less digits than its factorization.

213122138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384976.

The product of its digits is 576, while the sum is 23.

The square root of 213122138 is about 14598.7032985810. The cubic root of 213122138 is about 597.3233903194.

The spelling of 213122138 in words is "two hundred thirteen million, one hundred twenty-two thousand, one hundred thirty-eight".