211551967823 has 8 divisors (see below), whose sum is σ = 241791696000. Its totient is φ = 181316744280.

The previous prime is 211551967811. The next prime is 211551967831. The reversal of 211551967823 is 328769155112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211551967823 - 2¹⁴ = 211551951439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211551967423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1024913 + ... + 1213898.

It is an arithmetic number, because the mean of its divisors is an integer number (30223962000).

Almost surely, 2^211551967823 is an apocalyptic number.

211551967823 is a deficient number, since it is larger than the sum of its proper divisors (30239728177).

211551967823 is a wasteful number, since it uses less digits than its factorization.

211551967823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252317.

The product of its digits is 907200, while the sum is 50.

The spelling of 211551967823 in words is "two hundred eleven billion, five hundred fifty-one million, nine hundred sixty-seven thousand, eight hundred twenty-three".