21104421101 has 4 divisors (see below), whose sum is σ = 21105047232. Its totient is φ = 21103794972.

The previous prime is 21104421097. The next prime is 21104421131. The reversal of 21104421101 is 10112440112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21104421101 - 2² = 21104421097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21104421101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104421131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259445 + ... + 330938.

It is an arithmetic number, because the mean of its divisors is an integer number (5276261808).

Almost surely, 2^21104421101 is an apocalyptic number.

It is an amenable number.

21104421101 is a deficient number, since it is larger than the sum of its proper divisors (626131).

21104421101 is an equidigital number, since it uses as much as digits as its factorization.

21104421101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626130.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21104421101 its reverse (10112440112), we get a palindrome (31216861213).

The spelling of 21104421101 in words is "twenty-one billion, one hundred four million, four hundred twenty-one thousand, one hundred one".