221200021212101 has 8 divisors (see below), whose sum is σ = 235011144806424. Its totient is φ = 207477715133440.

The previous prime is 221200021212047. The next prime is 221200021212119. The reversal of 221200021212101 is 101212120002122.

It can be written as a sum of positive squares in 4 ways, for example, as 68688043230625 + 152511977981476 = 8287825^2 + 12349574^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200021212101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221200021212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200021212151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22204373780 + ... + 22204383741.

It is an arithmetic number, because the mean of its divisors is an integer number (29376393100803).

Almost surely, 2^{221200021212101} is an apocalyptic number.

It is an amenable number.

221200021212101 is a deficient number, since it is larger than the sum of its proper divisors (13811123594323).

221200021212101 is a wasteful number, since it uses less digits than its factorization.

221200021212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44408757831.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221200021212101 its reverse (101212120002122), we get a palindrome (322412141214223).

The spelling of 221200021212101 in words is "two hundred twenty-one trillion, two hundred billion, twenty-one million, two hundred twelve thousand, one hundred one".