21104401011 has 4 divisors (see below), whose sum is σ = 28139201352. Its totient is φ = 14069600672.

The previous prime is 21104401009. The next prime is 21104401057. The reversal of 21104401011 is 11010440112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21104401011 - 2¹ = 21104401009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21104400011) 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, 3517400166 + ... + 3517400171.

It is an arithmetic number, because the mean of its divisors is an integer number (7034800338).

Almost surely, 2^21104401011 is an apocalyptic number.

21104401011 is a deficient number, since it is larger than the sum of its proper divisors (7034800341).

21104401011 is an equidigital number, since it uses as much as digits as its factorization.

21104401011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034800340.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21104401011 its reverse (11010440112), we get a palindrome (32114841123).

The spelling of 21104401011 in words is "twenty-one billion, one hundred four million, four hundred one thousand, eleven".