21010011001101 has 12 divisors (see below), whose sum is σ = 31394269312380. Its totient is φ = 13523685241920.

The previous prime is 21010011001039. The next prime is 21010011001121. The reversal of 21010011001101 is 10110011001012.

It can be written as a sum of positive squares in 2 ways, for example, as 10208830155876 + 10801180845225 = 3195126^2 + 3286515^2 .

It is not a de Polignac number, because 21010011001101 - 2¹⁵ = 21010010968333 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 (21010011001121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40249062960 + ... + 40249063481.

It is an arithmetic number, because the mean of its divisors is an integer number (2616189109365).

Almost surely, 2^{21010011001101} is an apocalyptic number.

It is an amenable number.

21010011001101 is a deficient number, since it is larger than the sum of its proper divisors (10384258311279).

21010011001101 is a wasteful number, since it uses less digits than its factorization.

21010011001101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80498126476 (or 80498126473 counting only the distinct ones).

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

Adding to 21010011001101 its reverse (10110011001012), we get a palindrome (31120022002113).

The spelling of 21010011001101 in words is "twenty-one trillion, ten billion, eleven million, one thousand, one hundred one".