221121000011001 has 4 divisors (see below), whose sum is σ = 294828000014672. Its totient is φ = 147414000007332.

The previous prime is 221121000010993. The next prime is 221121000011033. The reversal of 221121000011001 is 100110000121122.

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 221121000011001 - 2³ = 221121000010993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121000011101) 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, 36853500001831 + ... + 36853500001836.

It is an arithmetic number, because the mean of its divisors is an integer number (73707000003668).

Almost surely, 2^{221121000011001} is an apocalyptic number.

It is an amenable number.

221121000011001 is a deficient number, since it is larger than the sum of its proper divisors (73707000003671).

221121000011001 is an equidigital number, since it uses as much as digits as its factorization.

221121000011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73707000003670.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221121000011001 its reverse (100110000121122), we get a palindrome (321231000132123).

The spelling of 221121000011001 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, eleven thousand, one".