21110010001 has 4 divisors (see below), whose sum is σ = 21113090100. Its totient is φ = 21106929904.

The previous prime is 21110009971. The next prime is 21110010011. The reversal of 21110010001 is 10001001112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 633830976 + 20476179025 = 25176^2 + 143095^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110010001 - 2²⁹ = 20573139089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110010011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1529746 + ... + 1543483.

It is an arithmetic number, because the mean of its divisors is an integer number (5278272525).

Almost surely, 2^21110010001 is an apocalyptic number.

It is an amenable number.

21110010001 is a deficient number, since it is larger than the sum of its proper divisors (3080099).

21110010001 is an equidigital number, since it uses as much as digits as its factorization.

21110010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080098.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21110010001 its reverse (10001001112), we get a palindrome (31111011113).

The spelling of 21110010001 in words is "twenty-one billion, one hundred ten million, ten thousand, one".