21230110123221 has 16 divisors (see below), whose sum is σ = 30257972438400. Its totient is φ = 13207845108480.

The previous prime is 21230110123193. The next prime is 21230110123373. The reversal of 21230110123221 is 12232101103212.

It is not a de Polignac number, because 21230110123221 - 2¹¹ = 21230110121173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230110123421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3752225896 + ... + 3752231553.

It is an arithmetic number, because the mean of its divisors is an integer number (1891123277400).

Almost surely, 2^{21230110123221} is an apocalyptic number.

It is an amenable number.

21230110123221 is a deficient number, since it is larger than the sum of its proper divisors (9027862315179).

21230110123221 is a wasteful number, since it uses less digits than its factorization.

21230110123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7504457516.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21230110123221 its reverse (12232101103212), we get a palindrome (33462211226433).

The spelling of 21230110123221 in words is "twenty-one trillion, two hundred thirty billion, one hundred ten million, one hundred twenty-three thousand, two hundred twenty-one".