221212121212101 has 8 divisors (see below), whose sum is σ = 295205749945344. Its totient is φ = 147346619976800.

The previous prime is 221212121212073. The next prime is 221212121212123. The reversal of 221212121212101 is 101212121212122.

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

It is a cyclic number.

It is not a de Polignac number, because 221212121212101 - 2⁶ = 221212121212037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212121212151) 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, 32031870456 + ... + 32031877361.

It is an arithmetic number, because the mean of its divisors is an integer number (36900718743168).

Almost surely, 2^{221212121212101} is an apocalyptic number.

It is an amenable number.

221212121212101 is a deficient number, since it is larger than the sum of its proper divisors (73993628733243).

221212121212101 is a wasteful number, since it uses less digits than its factorization.

221212121212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64063748971.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221212121212101 its sum of digits (21), we get a palindrome (221212121212122).

Adding to 221212121212101 its reverse (101212121212122), we get a palindrome (322424242424223).

The spelling of 221212121212101 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, one hundred one".