21201222220011 has 8 divisors (see below), whose sum is σ = 31409218103760. Its totient is φ = 14134148146656.

The previous prime is 21201222219941. The next prime is 21201222220141. The reversal of 21201222220011 is 11002222210212.

It is a happy number.

21201222220011 is a `hidden beast` number, since 21 + 201 + 222 + 220 + 0 + 1 + 1 = 666.

It is not a de Polignac number, because 21201222220011 - 2¹⁹ = 21201221695723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201222230011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392615226270 + ... + 392615226323.

It is an arithmetic number, because the mean of its divisors is an integer number (3926152262970).

Almost surely, 2^{21201222220011} is an apocalyptic number.

21201222220011 is a deficient number, since it is larger than the sum of its proper divisors (10207995883749).

21201222220011 is an equidigital number, since it uses as much as digits as its factorization.

21201222220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785230452602 (or 785230452596 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21201222220011 its reverse (11002222210212), we get a palindrome (32203444430223).

The spelling of 21201222220011 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty thousand, eleven".