211721528927291 has 2 divisors, whose sum is σ = 211721528927292. Its totient is φ = 211721528927290.

The previous prime is 211721528927281. The next prime is 211721528927329. The reversal of 211721528927291 is 192729825127112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211721528927291 - 2¹⁸ = 211721528665147 is a prime.

It is a super-2 number, since 2×211721528927291² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211721528927291.

It is not a weakly prime, because it can be changed into another prime (211721528927231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105860764463645 + 105860764463646.

It is an arithmetic number, because the mean of its divisors is an integer number (105860764463646).

Almost surely, 2^{211721528927291} is an apocalyptic number.

211721528927291 is a deficient number, since it is larger than the sum of its proper divisors (1).

211721528927291 is an equidigital number, since it uses as much as digits as its factorization.

211721528927291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 59.

The spelling of 211721528927291 in words is "two hundred eleven trillion, seven hundred twenty-one billion, five hundred twenty-eight million, nine hundred twenty-seven thousand, two hundred ninety-one".