221002112121 has 16 divisors (see below), whose sum is σ = 347628515328. Its totient is φ = 122213149200.

The previous prime is 221002112119. The next prime is 221002112137. The reversal of 221002112121 is 121211200122.

221002112121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221002112121 - 2¹ = 221002112119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221002112121.

It is not an unprimeable number, because it can be changed into a prime (221002112171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169739835 + ... + 169741136.

It is an arithmetic number, because the mean of its divisors is an integer number (21726782208).

Almost surely, 2^221002112121 is an apocalyptic number.

221002112121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221002112121 is a deficient number, since it is larger than the sum of its proper divisors (126626403207).

221002112121 is a wasteful number, since it uses less digits than its factorization.

221002112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339481012.

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

Adding to 221002112121 its reverse (121211200122), we get a palindrome (342213312243).

The spelling of 221002112121 in words is "two hundred twenty-one billion, two million, one hundred twelve thousand, one hundred twenty-one".