221210100120121 has 8 divisors (see below), whose sum is σ = 252811646823744. Its totient is φ = 189608579373840.

The previous prime is 221210100120073. The next prime is 221210100120127. The reversal of 221210100120121 is 121021001012122.

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 221210100120121 - 2¹⁹ = 221210099595833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221210100120095 and 221210100120104.

It is not an unprimeable number, because it can be changed into a prime (221210100120127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17866326 + ... + 27597568.

It is an arithmetic number, because the mean of its divisors is an integer number (31601455852968).

Almost surely, 2^{221210100120121} is an apocalyptic number.

It is an amenable number.

221210100120121 is a deficient number, since it is larger than the sum of its proper divisors (31601546703623).

221210100120121 is an equidigital number, since it uses as much as digits as its factorization.

221210100120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978671.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221210100120121 its reverse (121021001012122), we get a palindrome (342231101132243).

The spelling of 221210100120121 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred million, one hundred twenty thousand, one hundred twenty-one".