221200001121021 has 128 divisors (see below), whose sum is σ = 338354798745600. Its totient is φ = 127415998218240.

The previous prime is 221200001120993. The next prime is 221200001121067. The reversal of 221200001121021 is 120121100002122.

It is not a de Polignac number, because 221200001121021 - 2⁷ = 221200001120893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200001121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 63986113725 + ... + 63986117181.

It is an arithmetic number, because the mean of its divisors is an integer number (2643396865200).

Almost surely, 2^{221200001121021} is an apocalyptic number.

It is an amenable number.

221200001121021 is a deficient number, since it is larger than the sum of its proper divisors (117154797624579).

221200001121021 is a wasteful number, since it uses less digits than its factorization.

221200001121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499.

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

Adding to 221200001121021 its reverse (120121100002122), we get a palindrome (341321101123143).

The spelling of 221200001121021 in words is "two hundred twenty-one trillion, two hundred billion, one million, one hundred twenty-one thousand, twenty-one".