221121100110121 has 4 divisors (see below), whose sum is σ = 221121382475392. Its totient is φ = 221120817744852.

The previous prime is 221121100110109. The next prime is 221121100110149. The reversal of 221121100110121 is 121011001121122.

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 a de Polignac number, because none of the positive numbers 2^k-221121100110121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221121100110095 and 221121100110104.

It is not an unprimeable number, because it can be changed into a prime (221121100110221) 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, 140004705 + ... + 141575278.

It is an arithmetic number, because the mean of its divisors is an integer number (55280345618848).

Almost surely, 2^{221121100110121} is an apocalyptic number.

It is an amenable number.

221121100110121 is a deficient number, since it is larger than the sum of its proper divisors (282365271).

221121100110121 is an equidigital number, since it uses as much as digits as its factorization.

221121100110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282365270.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 221121100110121 its reverse (121011001121122), we get a palindrome (342132101231243).

It can be divided in two parts, 2211211001 and 10121, that added together give a palindrome (2211221122).

The spelling of 221121100110121 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred million, one hundred ten thousand, one hundred twenty-one".