21222011202111 has 8 divisors (see below), whose sum is σ = 31440016595760. Its totient is φ = 14148007468056.

The previous prime is 21222011202101. The next prime is 21222011202113. The reversal of 21222011202111 is 11120211022212.

21222011202111 is a `hidden beast` number, since 212 + 220 + 1 + 1 + 20 + 211 + 1 = 666.

It is not a de Polignac number, because 21222011202111 - 2¹⁷ = 21222011071039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222011202113) 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, 393000207420 + ... + 393000207473.

It is an arithmetic number, because the mean of its divisors is an integer number (3930002074470).

Almost surely, 2^{21222011202111} is an apocalyptic number.

21222011202111 is a deficient number, since it is larger than the sum of its proper divisors (10218005393649).

21222011202111 is an equidigital number, since it uses as much as digits as its factorization.

21222011202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786000414902 (or 786000414896 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21222011202111 its reverse (11120211022212), we get a palindrome (32342222224323).

The spelling of 21222011202111 in words is "twenty-one trillion, two hundred twenty-two billion, eleven million, two hundred two thousand, one hundred eleven".