221020001122001 has 4 divisors (see below), whose sum is σ = 221050474037172. Its totient is φ = 220989528206832.

The previous prime is 221020001121923. The next prime is 221020001122069. The reversal of 221020001122001 is 100221100020122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190700881683601 + 30319119438400 = 13809449^2 + 5506280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020001122001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221020001124001) 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, 15236446706 + ... + 15236461211.

It is an arithmetic number, because the mean of its divisors is an integer number (55262618509293).

Almost surely, 2^{221020001122001} is an apocalyptic number.

It is an amenable number.

221020001122001 is a deficient number, since it is larger than the sum of its proper divisors (30472915171).

221020001122001 is an equidigital number, since it uses as much as digits as its factorization.

221020001122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30472915170.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221020001122001 its reverse (100221100020122), we get a palindrome (321241101142123).

The spelling of 221020001122001 in words is "two hundred twenty-one trillion, twenty billion, one million, one hundred twenty-two thousand, one".