221201011010001 has 64 divisors (see below), whose sum is σ = 334051428483072. Its totient is φ = 129016087200000.

The previous prime is 221201011009999. The next prime is 221201011010029. The reversal of 221201011010001 is 100010110102122.

It is not a de Polignac number, because 221201011010001 - 2¹ = 221201011009999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221201011012001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121306116 + ... + 123116106.

It is an arithmetic number, because the mean of its divisors is an integer number (5219553570048).

Almost surely, 2^{221201011010001} is an apocalyptic number.

It is an amenable number.

221201011010001 is a deficient number, since it is larger than the sum of its proper divisors (112850417473071).

221201011010001 is a wasteful number, since it uses less digits than its factorization.

221201011010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811134.

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

Adding to 221201011010001 its reverse (100010110102122), we get a palindrome (321211121112123).

The spelling of 221201011010001 in words is "two hundred twenty-one trillion, two hundred one billion, eleven million, ten thousand, one".