21011021020211 has 2 divisors, whose sum is σ = 21011021020212. Its totient is φ = 21011021020210.

The previous prime is 21011021020159. The next prime is 21011021020259. The reversal of 21011021020211 is 11202012011012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011021020211 - 2³⁰ = 21009947278387 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011021020291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505510510105 + 10505510510106.

It is an arithmetic number, because the mean of its divisors is an integer number (10505510510106).

Almost surely, 2^{21011021020211} is an apocalyptic number.

21011021020211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011021020211 is an equidigital number, since it uses as much as digits as its factorization.

21011021020211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011021020211 its reverse (11202012011012), we get a palindrome (32213033031223).

The spelling of 21011021020211 in words is "twenty-one trillion, eleven billion, twenty-one million, twenty thousand, two hundred eleven".