209534940213 has 16 divisors (see below), whose sum is σ = 281608636416. Its totient is φ = 138575828160.

The previous prime is 209534940203. The next prime is 209534940221. The reversal of 209534940213 is 312049435902.

It is not a de Polignac number, because 209534940213 - 2⁶ = 209534940149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209534940203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4756195 + ... + 4800047.

It is an arithmetic number, because the mean of its divisors is an integer number (17600539776).

Almost surely, 2^209534940213 is an apocalyptic number.

It is an amenable number.

209534940213 is a deficient number, since it is larger than the sum of its proper divisors (72073696203).

209534940213 is a wasteful number, since it uses less digits than its factorization.

209534940213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56524.

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 209534940213 in words is "two hundred nine billion, five hundred thirty-four million, nine hundred forty thousand, two hundred thirteen".