21950500211 has 2 divisors, whose sum is σ = 21950500212. Its totient is φ = 21950500210.

The previous prime is 21950500199. The next prime is 21950500261. The reversal of 21950500211 is 11200505912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21950500211 - 2¹⁰ = 21950499187 is a prime.

It is a super-2 number, since 2×21950500211² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21950500261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10975250105 + 10975250106.

It is an arithmetic number, because the mean of its divisors is an integer number (10975250106).

Almost surely, 2^21950500211 is an apocalyptic number.

21950500211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21950500211 is an equidigital number, since it uses as much as digits as its factorization.

21950500211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 21950500211 in words is "twenty-one billion, nine hundred fifty million, five hundred thousand, two hundred eleven".