221200001020001 has 16 divisors (see below), whose sum is σ = 236339554291200. Its totient is φ = 206568854083200.

The previous prime is 221200001019983. The next prime is 221200001020067. The reversal of 221200001020001 is 100020100002122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221200001020001 - 2¹⁰ = 221200001018977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221200001020091) 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, 66304316 + ... + 69560493.

It is an arithmetic number, because the mean of its divisors is an integer number (14771222143200).

Almost surely, 2^{221200001020001} is an apocalyptic number.

It is an amenable number.

221200001020001 is a deficient number, since it is larger than the sum of its proper divisors (15139553271199).

221200001020001 is a wasteful number, since it uses less digits than its factorization.

221200001020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135866680.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221200001020001 its reverse (100020100002122), we get a palindrome (321220101022123).

The spelling of 221200001020001 in words is "two hundred twenty-one trillion, two hundred billion, one million, twenty thousand, one".