212111220309 has 4 divisors (see below), whose sum is σ = 282814960416. Its totient is φ = 141407480204.

The previous prime is 212111220301. The next prime is 212111220323. The reversal of 212111220309 is 903022111212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212111220309 - 2³ = 212111220301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111220301) 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, 35351870049 + ... + 35351870054.

It is an arithmetic number, because the mean of its divisors is an integer number (70703740104).

Almost surely, 2^212111220309 is an apocalyptic number.

It is an amenable number.

212111220309 is a deficient number, since it is larger than the sum of its proper divisors (70703740107).

212111220309 is an equidigital number, since it uses as much as digits as its factorization.

212111220309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70703740106.

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 212111220309 in words is "two hundred twelve billion, one hundred eleven million, two hundred twenty thousand, three hundred nine".