21111201104 has 80 divisors (see below), whose sum is σ = 48672051456. Its totient is φ = 8682163200.

The previous prime is 21111201101. The next prime is 21111201149. The reversal of 21111201104 is 40110211112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242429 + ... + 317795.

Almost surely, 2^21111201104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111201104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24336025728).

21111201104 is an abundant number, since it is smaller than the sum of its proper divisors (27560850352).

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

21111201104 is a wasteful number, since it uses less digits than its factorization.

21111201104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75484 (or 75478 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111201104 its reverse (40110211112), we get a palindrome (61221412216).

The spelling of 21111201104 in words is "twenty-one billion, one hundred eleven million, two hundred one thousand, one hundred four".