211963540985 has 16 divisors (see below), whose sum is σ = 290905572096. Its totient is φ = 145240070208.

The previous prime is 211963540961. The next prime is 211963541029. The reversal of 211963540985 is 589045369112.

It is a cyclic number.

It is not a de Polignac number, because 211963540985 - 2¹⁰ = 211963539961 is a prime.

It is a Duffinian 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, 2167262 + ... + 2262951.

It is an arithmetic number, because the mean of its divisors is an integer number (18181598256).

Almost surely, 2^211963540985 is an apocalyptic number.

It is an amenable number.

211963540985 is a deficient number, since it is larger than the sum of its proper divisors (78942031111).

211963540985 is a wasteful number, since it uses less digits than its factorization.

211963540985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431592.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 211963540985 in words is "two hundred eleven billion, nine hundred sixty-three million, five hundred forty thousand, nine hundred eighty-five".