21201102110021 has 8 divisors (see below), whose sum is σ = 21294623081088. Its totient is φ = 21107653000000.

The previous prime is 21201102109939. The next prime is 21201102110033. The reversal of 21201102110021 is 12001120110212.

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 21201102110021 - 2¹⁰ = 21201102108997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201102109978 and 21201102110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201102116021) 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 7 ways as a sum of consecutive naturals, for example, 17373860 + ... + 18554061.

It is an arithmetic number, because the mean of its divisors is an integer number (2661827885136).

Almost surely, 2^{21201102110021} is an apocalyptic number.

It is an amenable number.

21201102110021 is a deficient number, since it is larger than the sum of its proper divisors (93520971067).

21201102110021 is a wasteful number, since it uses less digits than its factorization.

21201102110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35930523.

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

Adding to 21201102110021 its reverse (12001120110212), we get a palindrome (33202222220233).

The spelling of 21201102110021 in words is "twenty-one trillion, two hundred one billion, one hundred two million, one hundred ten thousand, twenty-one".