21120441100 has 144 divisors (see below), whose sum is σ = 50916491136. Its totient is φ = 7603252800.

The previous prime is 21120441091. The next prime is 21120441149. The reversal of 21120441100 is 114402112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14240959 + ... + 14242441.

It is an arithmetic number, because the mean of its divisors is an integer number (353586744).

Almost surely, 2^21120441100 is an apocalyptic number.

21120441100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120441100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25458245568).

21120441100 is an abundant number, since it is smaller than the sum of its proper divisors (29796050036).

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

21120441100 is a wasteful number, since it uses less digits than its factorization.

21120441100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120441100 its reverse (114402112), we get a palindrome (21234843212).

The spelling of 21120441100 in words is "twenty-one billion, one hundred twenty million, four hundred forty-one thousand, one hundred".