21221000260211 has 2 divisors, whose sum is σ = 21221000260212. Its totient is φ = 21221000260210.

The previous prime is 21221000260193. The next prime is 21221000260231. The reversal of 21221000260211 is 11206200012212.

It is an a-pointer prime, because the next prime (21221000260231) can be obtained adding 21221000260211 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221000260211 - 2³⁸ = 20946122353267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221000260231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610500130105 + 10610500130106.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500130106).

Almost surely, 2^{21221000260211} is an apocalyptic number.

21221000260211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221000260211 is an equidigital number, since it uses as much as digits as its factorization.

21221000260211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21221000260211 its reverse (11206200012212), we get a palindrome (32427200272423).

The spelling of 21221000260211 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred sixty thousand, two hundred eleven".