211972197983520 has 192 divisors, whose sum is σ = 761373442730880. Its totient is φ = 49108491091968.

The previous prime is 211972197983489. The next prime is 211972197983543. The reversal of 211972197983520 is 25389791279112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 999008730 + ... + 999220889.

It is an arithmetic number, because the mean of its divisors is an integer number (3965486680890).

Almost surely, 2^{211972197983520} is an apocalyptic number.

211972197983520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211972197983520 is an abundant number, since it is smaller than the sum of its proper divisors (549401244747360).

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

211972197983520 is a wasteful number, since it uses less digits than its factorization.

211972197983520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998229667 (or 1998229659 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 66.

The spelling of 211972197983520 in words is "two hundred eleven trillion, nine hundred seventy-two billion, one hundred ninety-seven million, nine hundred eighty-three thousand, five hundred twenty".