21011101111101 has 8 divisors (see below), whose sum is σ = 28980829118880. Its totient is φ = 13524386922032.

The previous prime is 21011101111097. The next prime is 21011101111109. The reversal of 21011101111101 is 10111110111012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011101111101 - 2² = 21011101111097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011101111109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120753454575 + ... + 120753454748.

It is an arithmetic number, because the mean of its divisors is an integer number (3622603639860).

Almost surely, 2^{21011101111101} is an apocalyptic number.

It is an amenable number.

21011101111101 is a deficient number, since it is larger than the sum of its proper divisors (7969728007779).

21011101111101 is a wasteful number, since it uses less digits than its factorization.

21011101111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241506909355.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 21011101111101 its reverse (10111110111012), we get a palindrome (31122211222113).

The spelling of 21011101111101 in words is "twenty-one trillion, eleven billion, one hundred one million, one hundred eleven thousand, one hundred one".