213212429 has 2 divisors, whose sum is σ = 213212430. Its totient is φ = 213212428.

The previous prime is 213212411. The next prime is 213212431. The reversal of 213212429 is 924212312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166358404 + 46854025 = 12898^2 + 6845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213212429 is a prime.

Together with 213212431, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 213212398 and 213212407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213212029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106606214 + 106606215.

It is an arithmetic number, because the mean of its divisors is an integer number (106606215).

Almost surely, 2^213212429 is an apocalyptic number.

It is an amenable number.

213212429 is a deficient number, since it is larger than the sum of its proper divisors (1).

213212429 is an equidigital number, since it uses as much as digits as its factorization.

213212429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 213212429 is about 14601.7954033057. The cubic root of 213212429 is about 597.4077321154.

The spelling of 213212429 in words is "two hundred thirteen million, two hundred twelve thousand, four hundred twenty-nine".