221010010112121 has 4 divisors (see below), whose sum is σ = 294680013482832. Its totient is φ = 147340006741412.

The previous prime is 221010010112119. The next prime is 221010010112141. The reversal of 221010010112121 is 121211010010122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221010010112121 - 2¹ = 221010010112119 is a prime.

It is a super-3 number, since 3×221010010112121³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 221010010112121.

It is not an unprimeable number, because it can be changed into a prime (221010010112141) 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 3 ways as a sum of consecutive naturals, for example, 36835001685351 + ... + 36835001685356.

It is an arithmetic number, because the mean of its divisors is an integer number (73670003370708).

Almost surely, 2^{221010010112121} is an apocalyptic number.

It is an amenable number.

221010010112121 is a deficient number, since it is larger than the sum of its proper divisors (73670003370711).

221010010112121 is an equidigital number, since it uses as much as digits as its factorization.

221010010112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73670003370710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221010010112121 its reverse (121211010010122), we get a palindrome (342221020122243).

The spelling of 221010010112121 in words is "two hundred twenty-one trillion, ten billion, ten million, one hundred twelve thousand, one hundred twenty-one".