221101212121001 has 8 divisors (see below), whose sum is σ = 225326076059520. Its totient is φ = 216912001043088.

The previous prime is 221101212120991. The next prime is 221101212121003. The reversal of 221101212121001 is 100121212101122.

221101212121001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-221101212121001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221101212121003) 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, 8913202631 + ... + 8913227436.

It is an arithmetic number, because the mean of its divisors is an integer number (28165759507440).

Almost surely, 2^{221101212121001} is an apocalyptic number.

It is an amenable number.

221101212121001 is a deficient number, since it is larger than the sum of its proper divisors (4224863938519).

221101212121001 is a wasteful number, since it uses less digits than its factorization.

221101212121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17826430303.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221101212121001 its reverse (100121212101122), we get a palindrome (321222424222123).

The spelling of 221101212121001 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, one".