213158721829 has 2 divisors, whose sum is σ = 213158721830. Its totient is φ = 213158721828.

The previous prime is 213158721817. The next prime is 213158721857. The reversal of 213158721829 is 928127851312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114970499329 + 98188222500 = 339073^2 + 313350^2 .

It is a cyclic number.

It is not a de Polignac number, because 213158721829 - 2⁹ = 213158721317 is a prime.

It is a super-2 number, since 2×213158721829² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213158721329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106579360914 + 106579360915.

It is an arithmetic number, because the mean of its divisors is an integer number (106579360915).

Almost surely, 2^213158721829 is an apocalyptic number.

It is an amenable number.

213158721829 is a deficient number, since it is larger than the sum of its proper divisors (1).

213158721829 is an equidigital number, since it uses as much as digits as its factorization.

213158721829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The spelling of 213158721829 in words is "two hundred thirteen billion, one hundred fifty-eight million, seven hundred twenty-one thousand, eight hundred twenty-nine".