221320221301 has 4 divisors (see below), whose sum is σ = 228951953100. Its totient is φ = 213688489504.

The previous prime is 221320221271. The next prime is 221320221307. The reversal of 221320221301 is 103122023122.

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 100789740676 + 120530480625 = 317474^2 + 347175^2 .

It is a cyclic number.

It is not a de Polignac number, because 221320221301 - 2¹⁹ = 221319697013 is a prime.

It is a super-2 number, since 2×221320221301² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221320221307) 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, 3815865856 + ... + 3815865913.

It is an arithmetic number, because the mean of its divisors is an integer number (57237988275).

Almost surely, 2^221320221301 is an apocalyptic number.

It is an amenable number.

221320221301 is a deficient number, since it is larger than the sum of its proper divisors (7631731799).

221320221301 is an equidigital number, since it uses as much as digits as its factorization.

221320221301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631731798.

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

Adding to 221320221301 its reverse (103122023122), we get a palindrome (324442244423).

The spelling of 221320221301 in words is "two hundred twenty-one billion, three hundred twenty million, two hundred twenty-one thousand, three hundred one".