221021122021121 has 4 divisors (see below), whose sum is σ = 221054213976000. Its totient is φ = 220988030066244.

The previous prime is 221021122021099. The next prime is 221021122021163. The reversal of 221021122021121 is 121120221120122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221021122021121 - 2⁶ = 221021122021057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221021122021093 and 221021122021102.

It is not an unprimeable number, because it can be changed into a prime (221021122021421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16545967421 + ... + 16545980778.

It is an arithmetic number, because the mean of its divisors is an integer number (55263553494000).

Almost surely, 2^{221021122021121} is an apocalyptic number.

It is an amenable number.

221021122021121 is a deficient number, since it is larger than the sum of its proper divisors (33091954879).

221021122021121 is an equidigital number, since it uses as much as digits as its factorization.

221021122021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33091954878.

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

Adding to 221021122021121 its reverse (121120221120122), we get a palindrome (342141343141243).

Subtracting from 221021122021121 its reverse (121120221120122), we obtain a palindrome (99900900900999).

The spelling of 221021122021121 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty-one".