21210220212011 has 2 divisors, whose sum is σ = 21210220212012. Its totient is φ = 21210220212010.

The previous prime is 21210220211989. The next prime is 21210220212101. The reversal of 21210220212011 is 11021202201212.

Together with next prime (21210220212101) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210220212011 - 2²² = 21210216017707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21210220214011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605110106005 + 10605110106006.

It is an arithmetic number, because the mean of its divisors is an integer number (10605110106006).

Almost surely, 2^{21210220212011} is an apocalyptic number.

21210220212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210220212011 is an equidigital number, since it uses as much as digits as its factorization.

21210220212011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210220212011 its reverse (11021202201212), we get a palindrome (32231422413223).

The spelling of 21210220212011 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, two hundred twelve thousand, eleven".