21021102211021 has 8 divisors (see below), whose sum is σ = 22934163360384. Its totient is φ = 19108383037920.

The previous prime is 21021102210947. The next prime is 21021102211027. The reversal of 21021102211021 is 12011220112012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21021102211021 - 2¹⁹ = 21021101686733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021102210986 and 21021102211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021102211027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85365525 + ... + 85611418.

It is an arithmetic number, because the mean of its divisors is an integer number (2866770420048).

Almost surely, 2^{21021102211021} is an apocalyptic number.

It is an amenable number.

21021102211021 is a deficient number, since it is larger than the sum of its proper divisors (1913061149363).

21021102211021 is a wasteful number, since it uses less digits than its factorization.

21021102211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170988131.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021102211021 its reverse (12011220112012), we get a palindrome (33032322323033).

The spelling of 21021102211021 in words is "twenty-one trillion, twenty-one billion, one hundred two million, two hundred eleven thousand, twenty-one".