21000011101101 has 24 divisors (see below), whose sum is σ = 32118018064704. Its totient is φ = 13176332311680.

The previous prime is 21000011101051. The next prime is 21000011101129. The reversal of 21000011101101 is 10110111000012.

It is not a de Polignac number, because 21000011101101 - 2¹³ = 21000011092909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000011101141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14122440 + ... + 15538446.

It is an arithmetic number, because the mean of its divisors is an integer number (1338250752696).

Almost surely, 2^{21000011101101} is an apocalyptic number.

It is an amenable number.

21000011101101 is a deficient number, since it is larger than the sum of its proper divisors (11118006963603).

21000011101101 is a wasteful number, since it uses less digits than its factorization.

21000011101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512961 (or 1512958 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 21000011101101 its reverse (10110111000012), we get a palindrome (31110122101113).

The spelling of 21000011101101 in words is "twenty-one trillion, eleven million, one hundred one thousand, one hundred one".