209944764212 has 12 divisors (see below), whose sum is σ = 380072418180. Its totient is φ = 101352644736.

The previous prime is 209944764209. The next prime is 209944764223. The reversal of 209944764212 is 212467449902.

It can be written as a sum of positive squares in 2 ways, for example, as 71563740196 + 138381024016 = 267514^2 + 371996^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904934213 + ... + 904934444.

It is an arithmetic number, because the mean of its divisors is an integer number (31672701515).

Almost surely, 2^209944764212 is an apocalyptic number.

It is an amenable number.

209944764212 is a deficient number, since it is larger than the sum of its proper divisors (170127653968).

209944764212 is a wasteful number, since it uses less digits than its factorization.

209944764212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809868690 (or 1809868688 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 209944764212 in words is "two hundred nine billion, nine hundred forty-four million, seven hundred sixty-four thousand, two hundred twelve".