21221102110001 has 4 divisors (see below), whose sum is σ = 21260327807604. Its totient is φ = 21181876412400.

The previous prime is 21221102109979. The next prime is 21221102110009. The reversal of 21221102110001 is 10001120112212.

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 15350410561600 + 5870691548401 = 3917960^2 + 2422951^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221102110001 - 2¹⁰ = 21221102108977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221102110009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19612847990 + ... + 19612849071.

It is an arithmetic number, because the mean of its divisors is an integer number (5315081951901).

Almost surely, 2^{21221102110001} is an apocalyptic number.

It is an amenable number.

21221102110001 is a deficient number, since it is larger than the sum of its proper divisors (39225697603).

21221102110001 is an equidigital number, since it uses as much as digits as its factorization.

21221102110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39225697602.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221102110001 its reverse (10001120112212), we get a palindrome (31222222222213).

The spelling of 21221102110001 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred ten thousand, one".