212010311309 has 4 divisors (see below), whose sum is σ = 216010505916. Its totient is φ = 208010116704.

The previous prime is 212010311299. The next prime is 212010311327. The reversal of 212010311309 is 903113010212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168518460100 + 43491851209 = 410510^2 + 208547^2 .

It is a cyclic number.

It is not a de Polignac number, because 212010311309 - 2¹² = 212010307213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212010311389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000097224 + ... + 2000097329.

It is an arithmetic number, because the mean of its divisors is an integer number (54002626479).

Almost surely, 2^212010311309 is an apocalyptic number.

It is an amenable number.

212010311309 is a deficient number, since it is larger than the sum of its proper divisors (4000194607).

212010311309 is an equidigital number, since it uses as much as digits as its factorization.

212010311309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000194606.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 212010311309 in words is "two hundred twelve billion, ten million, three hundred eleven thousand, three hundred nine".