211704613021 has 24 divisors (see below), whose sum is σ = 234701056800. Its totient is φ = 190808698080.

The previous prime is 211704613009. The next prime is 211704613067. The reversal of 211704613021 is 120316407112.

It is not a de Polignac number, because 211704613021 - 2¹⁹ = 211704088733 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 (211704613321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9851130 + ... + 9872596.

It is an arithmetic number, because the mean of its divisors is an integer number (9779210700).

Almost surely, 2^211704613021 is an apocalyptic number.

It is an amenable number.

211704613021 is a deficient number, since it is larger than the sum of its proper divisors (22996443779).

211704613021 is a wasteful number, since it uses less digits than its factorization.

211704613021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22185 (or 22174 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 211704613021 in words is "two hundred eleven billion, seven hundred four million, six hundred thirteen thousand, twenty-one".