21222020011 has 2 divisors, whose sum is σ = 21222020012. Its totient is φ = 21222020010.

The previous prime is 21222020003. The next prime is 21222020063. The reversal of 21222020011 is 11002022212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222020011 - 2³ = 21222020003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222019973 and 21222020000.

It is not a weakly prime, because it can be changed into another prime (21222021011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611010005 + 10611010006.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010006).

Almost surely, 2^21222020011 is an apocalyptic number.

21222020011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222020011 is an equidigital number, since it uses as much as digits as its factorization.

21222020011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21222020011 its reverse (11002022212), we get a palindrome (32224042223).

The spelling of 21222020011 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, eleven".