21220033021121 has 16 divisors (see below), whose sum is σ = 23565617334528. Its totient is φ = 18945603507600.

The previous prime is 21220033021093. The next prime is 21220033021127. The reversal of 21220033021121 is 12112033002212.

It is a de Polignac number, because none of the positive numbers 2^k-21220033021121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220033021093 and 21220033021102.

It is not an unprimeable number, because it can be changed into a prime (21220033021127) 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, 43249175 + ... + 43737068.

It is an arithmetic number, because the mean of its divisors is an integer number (1472851083408).

Almost surely, 2^{21220033021121} is an apocalyptic number.

It is an amenable number.

21220033021121 is a deficient number, since it is larger than the sum of its proper divisors (2345584313407).

21220033021121 is a wasteful number, since it uses less digits than its factorization.

21220033021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86986652.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21220033021121 its reverse (12112033002212), we get a palindrome (33332066023333).

The spelling of 21220033021121 in words is "twenty-one trillion, two hundred twenty billion, thirty-three million, twenty-one thousand, one hundred twenty-one".