213121079 has 2 divisors, whose sum is σ = 213121080. Its totient is φ = 213121078.

The previous prime is 213121067. The next prime is 213121093. The reversal of 213121079 is 970121312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213121079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213121019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560539 + 106560540.

It is an arithmetic number, because the mean of its divisors is an integer number (106560540).

Almost surely, 2^213121079 is an apocalyptic number.

213121079 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121079 is an equidigital number, since it uses as much as digits as its factorization.

213121079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 213121079 is about 14598.6670281913. The cubic root of 213121079 is about 597.3224009548.

The spelling of 213121079 in words is "two hundred thirteen million, one hundred twenty-one thousand, seventy-nine".