209534940212 has 48 divisors (see below), whose sum is σ = 416184518400. Its totient is φ = 91506568320.

The previous prime is 209534940203. The next prime is 209534940221. The reversal of 209534940212 is 212049435902.

It is an interprime number because it is at equal distance from previous prime (209534940203) and next prime (209534940221).

It is a self number, because there is not a number n which added to its sum of digits gives 209534940212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681989 + ... + 940307.

It is an arithmetic number, because the mean of its divisors is an integer number (8670510800).

Almost surely, 2^209534940212 is an apocalyptic number.

It is an amenable number.

209534940212 is a deficient number, since it is larger than the sum of its proper divisors (206649578188).

209534940212 is a wasteful number, since it uses less digits than its factorization.

209534940212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259176 (or 259174 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 209534940212 in words is "two hundred nine billion, five hundred thirty-four million, nine hundred forty thousand, two hundred twelve".