221001200001121 has 4 divisors (see below), whose sum is σ = 221151438751744. Its totient is φ = 220850961250500.

The previous prime is 221001200001091. The next prime is 221001200001143. The reversal of 221001200001121 is 121100002100122.

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 221001200001121 - 2¹⁷ = 221001199870049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001200001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75119373105 + ... + 75119376046.

It is an arithmetic number, because the mean of its divisors is an integer number (55287859687936).

Almost surely, 2^{221001200001121} is an apocalyptic number.

It is an amenable number.

221001200001121 is a deficient number, since it is larger than the sum of its proper divisors (150238750623).

221001200001121 is a wasteful number, since it uses less digits than its factorization.

221001200001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150238750622.

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

Adding to 221001200001121 its reverse (121100002100122), we get a palindrome (342101202101243).

The spelling of 221001200001121 in words is "two hundred twenty-one trillion, one billion, two hundred million, one thousand, one hundred twenty-one".