221210100002121 has 16 divisors (see below), whose sum is σ = 297842467039104. Its totient is φ = 146025875193984.

The previous prime is 221210100002117. The next prime is 221210100002131. The reversal of 221210100002121 is 121200001012122.

It is not a de Polignac number, because 221210100002121 - 2² = 221210100002117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221210100002121.

It is not an unprimeable number, because it can be changed into a prime (221210100002131) 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, 35717556 + ... + 41450741.

It is an arithmetic number, because the mean of its divisors is an integer number (18615154189944).

Almost surely, 2^{221210100002121} is an apocalyptic number.

It is an amenable number.

221210100002121 is a deficient number, since it is larger than the sum of its proper divisors (76632367036983).

221210100002121 is a wasteful number, since it uses less digits than its factorization.

221210100002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77177680.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221210100002121 its reverse (121200001012122), we get a palindrome (342410101014243).

The spelling of 221210100002121 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred million, two thousand, one hundred twenty-one".