213040123 has 2 divisors, whose sum is σ = 213040124. Its totient is φ = 213040122.

The previous prime is 213040111. The next prime is 213040127. The reversal of 213040123 is 321040312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213040123 - 2²¹ = 210942971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213040097 and 213040106.

It is not a weakly prime, because it can be changed into another prime (213040127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106520061 + 106520062.

It is an arithmetic number, because the mean of its divisors is an integer number (106520062).

Almost surely, 2^213040123 is an apocalyptic number.

213040123 is a deficient number, since it is larger than the sum of its proper divisors (1).

213040123 is an equidigital number, since it uses as much as digits as its factorization.

213040123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 213040123 is about 14595.8940459295. The cubic root of 213040123 is about 597.2467585755.

Adding to 213040123 its reverse (321040312), we get a palindrome (534080435).

The spelling of 213040123 in words is "two hundred thirteen million, forty thousand, one hundred twenty-three".