221001221210001 has 32 divisors (see below), whose sum is σ = 317736833932800. Its totient is φ = 136212398674560.

The previous prime is 221001221209997. The next prime is 221001221210059. The reversal of 221001221210001 is 100012122100122.

It is not a de Polignac number, because 221001221210001 - 2² = 221001221209997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221001221210071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239376855 + ... + 240298316.

It is an arithmetic number, because the mean of its divisors is an integer number (9929276060400).

Almost surely, 2^{221001221210001} is an apocalyptic number.

It is an amenable number.

221001221210001 is a deficient number, since it is larger than the sum of its proper divisors (96735612722799).

221001221210001 is a wasteful number, since it uses less digits than its factorization.

221001221210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479675389.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221001221210001 its reverse (100012122100122), we get a palindrome (321013343310123).

The spelling of 221001221210001 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, two hundred ten thousand, one".