221001011220221 has 4 divisors (see below), whose sum is σ = 221141686594944. Its totient is φ = 220860335845500.

The previous prime is 221001011220217. The next prime is 221001011220239. The reversal of 221001011220221 is 122022110100122.

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 221001011220221 - 2² = 221001011220217 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 221001011220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001011220421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70337685005 + ... + 70337688146.

It is an arithmetic number, because the mean of its divisors is an integer number (55285421648736).

Almost surely, 2^{221001011220221} is an apocalyptic number.

It is an amenable number.

221001011220221 is a deficient number, since it is larger than the sum of its proper divisors (140675374723).

221001011220221 is a wasteful number, since it uses less digits than its factorization.

221001011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140675374722.

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

Adding to 221001011220221 its reverse (122022110100122), we get a palindrome (343023121320343).

The spelling of 221001011220221 in words is "two hundred twenty-one trillion, one billion, eleven million, two hundred twenty thousand, two hundred twenty-one".