21220101111 has 32 divisors (see below), whose sum is σ = 31834653696. Its totient is φ = 12462320000.

The previous prime is 21220101043. The next prime is 21220101137. The reversal of 21220101111 is 11110102212.

It is a cyclic number.

It is not a de Polignac number, because 21220101111 - 2¹⁸ = 21219838967 is a prime.

It is a super-2 number, since 2×21220101111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220101211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88921 + ... + 224381.

It is an arithmetic number, because the mean of its divisors is an integer number (994832928).

Almost surely, 2^21220101111 is an apocalyptic number.

21220101111 is a deficient number, since it is larger than the sum of its proper divisors (10614552585).

21220101111 is a wasteful number, since it uses less digits than its factorization.

21220101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135623.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21220101111 its reverse (11110102212), we get a palindrome (32330203323).

The spelling of 21220101111 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, one hundred eleven".