221000022121121 has 8 divisors (see below), whose sum is σ = 221559576592704. Its totient is φ = 220440482119440.

The previous prime is 221000022121111. The next prime is 221000022121129. The reversal of 221000022121121 is 121121220000122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000022121121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221000022121121.

It is not an unprimeable number, because it can be changed into a prime (221000022121129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27301466 + ... + 34458236.

It is an arithmetic number, because the mean of its divisors is an integer number (27694947074088).

Almost surely, 2^{221000022121121} is an apocalyptic number.

It is an amenable number.

221000022121121 is a deficient number, since it is larger than the sum of its proper divisors (559554471583).

221000022121121 is an equidigital number, since it uses as much as digits as its factorization.

221000022121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7234951.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221000022121121 its reverse (121121220000122), we get a palindrome (342121242121243).

The spelling of 221000022121121 in words is "two hundred twenty-one trillion, twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".