221000121121 has 8 divisors (see below), whose sum is σ = 238010431680. Its totient is φ = 203991282192.

The previous prime is 221000121113. The next prime is 221000121149. The reversal of 221000121121 is 121121000122.

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

It is a cyclic number.

It is not a de Polignac number, because 221000121121 - 2³ = 221000121113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000121521) 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, 45535 + ... + 666388.

It is an arithmetic number, because the mean of its divisors is an integer number (29751303960).

Almost surely, 2^221000121121 is an apocalyptic number.

It is an amenable number.

221000121121 is a deficient number, since it is larger than the sum of its proper divisors (17010310559).

221000121121 is a wasteful number, since it uses less digits than its factorization.

221000121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735815.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221000121121 its reverse (121121000122), we get a palindrome (342121121243).

The spelling of 221000121121 in words is "two hundred twenty-one billion, one hundred twenty-one thousand, one hundred twenty-one".