21110121100 has 36 divisors (see below), whose sum is σ = 46262539008. Its totient is φ = 8360440000.

The previous prime is 21110121089. The next prime is 21110121101. The reversal of 21110121100 is 112101112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21110121101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1034956 + ... + 1055155.

It is an arithmetic number, because the mean of its divisors is an integer number (1285070528).

Almost surely, 2^21110121100 is an apocalyptic number.

21110121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110121100 is an abundant number, since it is smaller than the sum of its proper divisors (25152417908).

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

21110121100 is a wasteful number, since it uses less digits than its factorization.

21110121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090226 (or 2090219 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21110121100 its reverse (112101112), we get a palindrome (21222222212).

It can be divided in two parts, 2111012 and 1100, that added together give a palindrome (2112112).

The spelling of 21110121100 in words is "twenty-one billion, one hundred ten million, one hundred twenty-one thousand, one hundred".