21111020011101 has 4 divisors (see below), whose sum is σ = 28148026681472. Its totient is φ = 14074013340732.

The previous prime is 21111020011069. The next prime is 21111020011157. The reversal of 21111020011101 is 10111002011112.

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 not a de Polignac number, because 21111020011101 - 2⁵ = 21111020011069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111020011001) 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, 3518503335181 + ... + 3518503335186.

It is an arithmetic number, because the mean of its divisors is an integer number (7037006670368).

Almost surely, 2^{21111020011101} is an apocalyptic number.

It is an amenable number.

21111020011101 is a deficient number, since it is larger than the sum of its proper divisors (7037006670371).

21111020011101 is an equidigital number, since it uses as much as digits as its factorization.

21111020011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037006670370.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21111020011101 its reverse (10111002011112), we get a palindrome (31222022022213).

The spelling of 21111020011101 in words is "twenty-one trillion, one hundred eleven billion, twenty million, eleven thousand, one hundred one".