21101022111100 has 18 divisors (see below), whose sum is σ = 45789217981304. Its totient is φ = 8440408844400.

The previous prime is 21101022111083. The next prime is 21101022111151. The reversal of 21101022111100 is 111122010112.

It is a happy number.

It is a super-4 number, since 4×21101022111100⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105505110456 + ... + 105505110655.

Almost surely, 2^{21101022111100} is an apocalyptic number.

21101022111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101022111100 is an abundant number, since it is smaller than the sum of its proper divisors (24688195870204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101022111100 is a wasteful number, since it uses less digits than its factorization.

21101022111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211010221125 (or 211010221118 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101022111100 its reverse (111122010112), we get a palindrome (21212144121212).

The spelling of 21101022111100 in words is "twenty-one trillion, one hundred one billion, twenty-two million, one hundred eleven thousand, one hundred".