221100220010121 has 16 divisors (see below), whose sum is σ = 313504550352000. Its totient is φ = 138123743908608.

The previous prime is 221100220010083. The next prime is 221100220010143. The reversal of 221100220010121 is 121010022001122.

It is not a de Polignac number, because 221100220010121 - 2¹⁹ = 221100219485833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221100220010121.

It is not an unprimeable number, because it can be changed into a prime (221100220030121) 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, 9465705421 + ... + 9465728778.

It is an arithmetic number, because the mean of its divisors is an integer number (19594034397000).

Almost surely, 2^{221100220010121} is an apocalyptic number.

It is an amenable number.

221100220010121 is a deficient number, since it is larger than the sum of its proper divisors (92404330341879).

221100220010121 is a wasteful number, since it uses less digits than its factorization.

221100220010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18931434448.

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

Adding to 221100220010121 its reverse (121010022001122), we get a palindrome (342110242011243).

The spelling of 221100220010121 in words is "two hundred twenty-one trillion, one hundred billion, two hundred twenty million, ten thousand, one hundred twenty-one".