21111220111102 has 16 divisors (see below), whose sum is σ = 34709356295424. Its totient is φ = 9550530423000.

The previous prime is 21111220111099. The next prime is 21111220111123. The reversal of 21111220111102 is 20111102211112.

It is a super-2 number, since 2×21111220111102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2273931174 + ... + 2273940457.

It is an arithmetic number, because the mean of its divisors is an integer number (2169334768464).

Almost surely, 2^{21111220111102} is an apocalyptic number.

21111220111102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111220111102 is a deficient number, since it is larger than the sum of its proper divisors (13598136184322).

21111220111102 is a wasteful number, since it uses less digits than its factorization.

21111220111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547871855.

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

Adding to 21111220111102 its reverse (20111102211112), we get a palindrome (41222322322214).

It can be divided in two parts, 211112 and 20111102, that multiplied together give a palindrome (4245694965424).

The spelling of 21111220111102 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, one hundred eleven thousand, one hundred two".