21210222020011 has 2 divisors, whose sum is σ = 21210222020012. Its totient is φ = 21210222020010.

The previous prime is 21210222019933. The next prime is 21210222020083. The reversal of 21210222020011 is 11002022201212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210222020011 - 2¹⁷ = 21210221888939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210222020311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605111010005 + 10605111010006.

It is an arithmetic number, because the mean of its divisors is an integer number (10605111010006).

Almost surely, 2^{21210222020011} is an apocalyptic number.

21210222020011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210222020011 is an equidigital number, since it uses as much as digits as its factorization.

21210222020011 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 16.

Adding to 21210222020011 its reverse (11002022201212), we get a palindrome (32212244221223).

The spelling of 21210222020011 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, twenty thousand, eleven".