21102021102001 has 48 divisors (see below), whose sum is σ = 26850850191360. Its totient is φ = 16192580564160.

The previous prime is 21102021101989. The next prime is 21102021102011. The reversal of 21102021102001 is 10020112020112.

It is not a de Polignac number, because 21102021102001 - 2⁷ = 21102021101873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102021102011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3250086 + ... + 7264096.

It is an arithmetic number, because the mean of its divisors is an integer number (559392712320).

Almost surely, 2^{21102021102001} is an apocalyptic number.

It is an amenable number.

21102021102001 is a deficient number, since it is larger than the sum of its proper divisors (5748829089359).

21102021102001 is a wasteful number, since it uses less digits than its factorization.

21102021102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014142 (or 4014113 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102021102001 its reverse (10020112020112), we get a palindrome (31122133122113).

The spelling of 21102021102001 in words is "twenty-one trillion, one hundred two billion, twenty-one million, one hundred two thousand, one".