211209971128 has 32 divisors (see below), whose sum is σ = 426524389200. Its totient is φ = 97471761408.

The previous prime is 211209971087. The next prime is 211209971177. The reversal of 211209971128 is 821179902112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998575 + ... + 1191457.

Almost surely, 2^211209971128 is an apocalyptic number.

It is an amenable number.

211209971128 is an abundant number, since it is smaller than the sum of its proper divisors (215314418072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211209971128 is a wasteful number, since it uses less digits than its factorization.

211209971128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203431 (or 203427 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 211209971128 in words is "two hundred eleven billion, two hundred nine million, nine hundred seventy-one thousand, one hundred twenty-eight".