213029123 has 2 divisors, whose sum is σ = 213029124. Its totient is φ = 213029122.

The previous prime is 213029119. The next prime is 213029137. The reversal of 213029123 is 321920312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213029123 - 2² = 213029119 is a prime.

It is a super-2 number, since 2×213029123² = 90762814492298258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (213029623) 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 as a sum of consecutive naturals, namely, 106514561 + 106514562.

It is an arithmetic number, because the mean of its divisors is an integer number (106514562).

Almost surely, 2^213029123 is an apocalyptic number.

213029123 is a deficient number, since it is larger than the sum of its proper divisors (1).

213029123 is an equidigital number, since it uses as much as digits as its factorization.

213029123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 213029123 is about 14595.5172227640. The cubic root of 213029123 is about 597.2364790917.

Adding to 213029123 its reverse (321920312), we get a palindrome (534949435).

The spelling of 213029123 in words is "two hundred thirteen million, twenty-nine thousand, one hundred twenty-three".