221330201200021 has 4 divisors (see below), whose sum is σ = 228962277103500. Its totient is φ = 213698125296544.

The previous prime is 221330201200019. The next prime is 221330201200037. The reversal of 221330201200021 is 120002102033122.

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 94760276091121 + 126569925108900 = 9734489^2 + 11250330^2 .

It is a cyclic number.

It is not a de Polignac number, because 221330201200021 - 2¹ = 221330201200019 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 (221330201200091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3816037951696 + ... + 3816037951753.

It is an arithmetic number, because the mean of its divisors is an integer number (57240569275875).

Almost surely, 2^{221330201200021} is an apocalyptic number.

It is an amenable number.

221330201200021 is a deficient number, since it is larger than the sum of its proper divisors (7632075903479).

221330201200021 is an equidigital number, since it uses as much as digits as its factorization.

221330201200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7632075903478.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221330201200021 its reverse (120002102033122), we get a palindrome (341332303233143).

The spelling of 221330201200021 in words is "two hundred twenty-one trillion, three hundred thirty billion, two hundred one million, two hundred thousand, twenty-one".