221100122001 has 32 divisors (see below), whose sum is σ = 330348930048. Its totient is φ = 130356008640.

The previous prime is 221100121999. The next prime is 221100122011. The reversal of 221100122001 is 100221001122.

It is not a de Polignac number, because 221100122001 - 2¹ = 221100121999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221100122011) 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, 9418060 + ... + 9441506.

It is an arithmetic number, because the mean of its divisors is an integer number (10323404064).

Almost surely, 2^221100122001 is an apocalyptic number.

It is an amenable number.

221100122001 is a deficient number, since it is larger than the sum of its proper divisors (109248808047).

221100122001 is a wasteful number, since it uses less digits than its factorization.

221100122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31221.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221100122001 its reverse (100221001122), we get a palindrome (321321123123).

The spelling of 221100122001 in words is "two hundred twenty-one billion, one hundred million, one hundred twenty-two thousand, one".