21112022221121 has 6 divisors (see below), whose sum is σ = 22860947139030. Its totient is φ = 19488020511648.

The previous prime is 21112022221067. The next prime is 21112022221349. The reversal of 21112022221121 is 12112222021112.

It can be written as a sum of positive squares in 3 ways, for example, as 2388755713600 + 18723266507521 = 1545560^2 + 4327039^2 .

It is not a de Polignac number, because 21112022221121 - 2⁶ = 21112022221057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21112022221093 and 21112022221102.

It is not an unprimeable number, because it can be changed into a prime (21112022221721) 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 5 ways as a sum of consecutive naturals, for example, 62461604036 + ... + 62461604373.

It is an arithmetic number, because the mean of its divisors is an integer number (3810157856505).

Almost surely, 2^{21112022221121} is an apocalyptic number.

It is an amenable number.

21112022221121 is a deficient number, since it is larger than the sum of its proper divisors (1748924917909).

21112022221121 is a wasteful number, since it uses less digits than its factorization.

21112022221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124923208435 (or 124923208422 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112022221121 its reverse (12112222021112), we get a palindrome (33224244242233).

The spelling of 21112022221121 in words is "twenty-one trillion, one hundred twelve billion, twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".