21011022220111 has 12 divisors (see below), whose sum is σ = 26663338031400. Its totient is φ = 16372225106160.

The previous prime is 21011022220109. The next prime is 21011022220121. The reversal of 21011022220111 is 11102222011012.

It is not a de Polignac number, because 21011022220111 - 2¹ = 21011022220109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011022220121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19490743636 + ... + 19490744713.

It is an arithmetic number, because the mean of its divisors is an integer number (2221944835950).

Almost surely, 2^{21011022220111} is an apocalyptic number.

21011022220111 is a deficient number, since it is larger than the sum of its proper divisors (5652315811289).

21011022220111 is a wasteful number, since it uses less digits than its factorization.

21011022220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38981488374 (or 38981488367 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21011022220111 its reverse (11102222011012), we get a palindrome (32113244231123).

The spelling of 21011022220111 in words is "twenty-one trillion, eleven billion, twenty-two million, two hundred twenty thousand, one hundred eleven".