221001202101001 has 16 divisors (see below), whose sum is σ = 253116893278080. Its totient is φ = 189021544064640.

The previous prime is 221001202100983. The next prime is 221001202101007. The reversal of 221001202101001 is 100101202100122.

It is not a de Polignac number, because 221001202101001 - 2⁹ = 221001202100489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001202101007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282407181 + ... + 283188661.

It is an arithmetic number, because the mean of its divisors is an integer number (15819805829880).

Almost surely, 2^{221001202101001} is an apocalyptic number.

It is an amenable number.

221001202101001 is a deficient number, since it is larger than the sum of its proper divisors (32115691177079).

221001202101001 is an equidigital number, since it uses as much as digits as its factorization.

221001202101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868464.

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

Adding to 221001202101001 its reverse (100101202100122), we get a palindrome (321102404201123).

The spelling of 221001202101001 in words is "two hundred twenty-one trillion, one billion, two hundred two million, one hundred one thousand, one".