21022201111 has 2 divisors, whose sum is σ = 21022201112.
Its totient is φ = 21022201110.
The previous prime is 21022201033. The next prime is 21022201153. The reversal of 21022201111 is 11110222012.
Adding to 21022201111 its reverse (11110222012), we get a palindrome (32132423123).
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 21022201111 - 211 = 21022199063 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 21022201091 and 21022201100.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (21022204111) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511100555 + 10511100556.
It is an arithmetic number, because the mean of its divisors is an integer number (10511100556).
Almost surely, 221022201111 is an apocalyptic number.
21022201111 is a deficient number, since it is larger than the sum of its proper divisors (1).
21022201111 is an equidigital number, since it uses as much as digits as its factorization.
21022201111 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 16, while the sum is 13.
The spelling of 21022201111 in words is "twenty-one billion, twenty-two million, two hundred one thousand, one hundred eleven".