221132121231121 has 4 divisors (see below), whose sum is σ = 230746561284672. Its totient is φ = 211517681177572.

The previous prime is 221132121231031. The next prime is 221132121231143. The reversal of 221132121231121 is 121132121231122.

It is a happy number.

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 not a de Polignac number, because 221132121231121 - 2³³ = 221123531296529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221132121231191) 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, 4807220026741 + ... + 4807220026786.

It is an arithmetic number, because the mean of its divisors is an integer number (57686640321168).

Almost surely, 2^{221132121231121} is an apocalyptic number.

It is an amenable number.

221132121231121 is a deficient number, since it is larger than the sum of its proper divisors (9614440053551).

221132121231121 is an equidigital number, since it uses as much as digits as its factorization.

221132121231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9614440053550.

The product of its digits is 576, while the sum is 25.

Adding to 221132121231121 its reverse (121132121231122), we get a palindrome (342264242462243).

Subtracting from 221132121231121 its reverse (121132121231122), we obtain a palindrome (99999999999999).

The spelling of 221132121231121 in words is "two hundred twenty-one trillion, one hundred thirty-two billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred twenty-one".