221020000010121 has 16 divisors (see below), whose sum is σ = 321185690473536. Its totient is φ = 134373605194176.

The previous prime is 221020000010093. The next prime is 221020000010137. The reversal of 221020000010121 is 121010000020122.

It is not a de Polignac number, because 221020000010121 - 2²¹ = 221019997912969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221020000010097 and 221020000010106.

It is not an unprimeable number, because it can be changed into a prime (221020000012121) 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 15 ways as a sum of consecutive naturals, for example, 34139632230 + ... + 34139638703.

It is an arithmetic number, because the mean of its divisors is an integer number (20074105654596).

Almost surely, 2^{221020000010121} is an apocalyptic number.

It is an amenable number.

221020000010121 is a deficient number, since it is larger than the sum of its proper divisors (100165690463415).

221020000010121 is a wasteful number, since it uses less digits than its factorization.

221020000010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68279271032.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221020000010121 its reverse (121010000020122), we get a palindrome (342030000030243).

The spelling of 221020000010121 in words is "two hundred twenty-one trillion, twenty billion, ten thousand, one hundred twenty-one".