212013123709 has 2 divisors, whose sum is σ = 212013123710. Its totient is φ = 212013123708.

The previous prime is 212013123697. The next prime is 212013123731. The reversal of 212013123709 is 907321310212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210786583225 + 1226540484 = 459115^2 + 35022^2 .

It is a cyclic number.

It is not a de Polignac number, because 212013123709 - 2²⁹ = 211476252797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212013123409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006561854 + 106006561855.

It is an arithmetic number, because the mean of its divisors is an integer number (106006561855).

Almost surely, 2^212013123709 is an apocalyptic number.

It is an amenable number.

212013123709 is a deficient number, since it is larger than the sum of its proper divisors (1).

212013123709 is an equidigital number, since it uses as much as digits as its factorization.

212013123709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 212013123709 in words is "two hundred twelve billion, thirteen million, one hundred twenty-three thousand, seven hundred nine".