221200021121021 has 16 divisors (see below), whose sum is σ = 228631737139200. Its totient is φ = 213786834125040.

The previous prime is 221200021121011. The next prime is 221200021121039. The reversal of 221200021121021 is 120121120002122.

It is a cyclic number.

It is not a de Polignac number, because 221200021121021 - 2⁴² = 216801974609917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200021121011) 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, 1131898700 + ... + 1132094106.

It is an arithmetic number, because the mean of its divisors is an integer number (14289483571200).

Almost surely, 2^{221200021121021} is an apocalyptic number.

It is an amenable number.

221200021121021 is a deficient number, since it is larger than the sum of its proper divisors (7431716018179).

221200021121021 is a wasteful number, since it uses less digits than its factorization.

221200021121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242624.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221200021121021 its reverse (120121120002122), we get a palindrome (341321141123143).

The spelling of 221200021121021 in words is "two hundred twenty-one trillion, two hundred billion, twenty-one million, one hundred twenty-one thousand, twenty-one".