221010102012121 has 4 divisors (see below), whose sum is σ = 225180103936932. Its totient is φ = 216840100087312.

The previous prime is 221010102012083. The next prime is 221010102012181. The reversal of 221010102012121 is 121210201010122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 183504411104400 + 37505690907721 = 13546380^2 + 6124189^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010102012121 - 2¹⁵ = 221010101979353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221010102012095 and 221010102012104.

It is not an unprimeable number, because it can be changed into a prime (221010102012181) 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 3 ways as a sum of consecutive naturals, for example, 2085000962326 + ... + 2085000962431.

It is an arithmetic number, because the mean of its divisors is an integer number (56295025984233).

Almost surely, 2^{221010102012121} is an apocalyptic number.

It is an amenable number.

221010102012121 is a deficient number, since it is larger than the sum of its proper divisors (4170001924811).

221010102012121 is an equidigital number, since it uses as much as digits as its factorization.

221010102012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170001924810.

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

Adding to 221010102012121 its reverse (121210201010122), we get a palindrome (342220303022243).

The spelling of 221010102012121 in words is "two hundred twenty-one trillion, ten billion, one hundred two million, twelve thousand, one hundred twenty-one".