212022020309 has 4 divisors (see below), whose sum is σ = 231296749440. Its totient is φ = 192747291180.

The previous prime is 212022020297. The next prime is 212022020317. The reversal of 212022020309 is 903020220212.

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 a de Polignac number, because none of the positive numbers 2^k-212022020309 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 (212022020209) 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, 9637364549 + ... + 9637364570.

It is an arithmetic number, because the mean of its divisors is an integer number (57824187360).

Almost surely, 2^212022020309 is an apocalyptic number.

It is an amenable number.

212022020309 is a deficient number, since it is larger than the sum of its proper divisors (19274729131).

212022020309 is a wasteful number, since it uses less digits than its factorization.

212022020309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19274729130.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 212022020309 in words is "two hundred twelve billion, twenty-two million, twenty thousand, three hundred nine".