213421079 has 2 divisors, whose sum is σ = 213421080. Its totient is φ = 213421078.

The previous prime is 213421073. The next prime is 213421097. The reversal of 213421079 is 970124312.

Together with next prime (213421097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213421079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213421073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106710539 + 106710540.

It is an arithmetic number, because the mean of its divisors is an integer number (106710540).

Almost surely, 2^213421079 is an apocalyptic number.

213421079 is a deficient number, since it is larger than the sum of its proper divisors (1).

213421079 is an equidigital number, since it uses as much as digits as its factorization.

213421079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 213421079 is about 14608.9383255595. The cubic root of 213421079 is about 597.6025432800.

The spelling of 213421079 in words is "two hundred thirteen million, four hundred twenty-one thousand, seventy-nine".