212291970209 has 16 divisors (see below), whose sum is σ = 237227823360. Its totient is φ = 188305046160.

The previous prime is 212291970199. The next prime is 212291970211. The reversal of 212291970209 is 902079192212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-212291970209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212291970209.

It is not an unprimeable number, because it can be changed into a prime (212291970299) 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, 210962 + ... + 684900.

It is an arithmetic number, because the mean of its divisors is an integer number (14826738960).

Almost surely, 2^212291970209 is an apocalyptic number.

It is an amenable number.

212291970209 is a deficient number, since it is larger than the sum of its proper divisors (24935853151).

212291970209 is a wasteful number, since it uses less digits than its factorization.

212291970209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474940.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 212291970209 in words is "two hundred twelve billion, two hundred ninety-one million, nine hundred seventy thousand, two hundred nine".