221980399 has 2 divisors, whose sum is σ = 221980400. Its totient is φ = 221980398.

The previous prime is 221980397. The next prime is 221980453. The reversal of 221980399 is 993089122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221980399 - 2¹ = 221980397 is a prime.

Together with 221980397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221980393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110990199 + 110990200.

It is an arithmetic number, because the mean of its divisors is an integer number (110990200).

Almost surely, 2^221980399 is an apocalyptic number.

221980399 is a deficient number, since it is larger than the sum of its proper divisors (1).

221980399 is an equidigital number, since it uses as much as digits as its factorization.

221980399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 221980399 is about 14899.0066447398. The cubic root of 221980399 is about 605.4870735539.

The spelling of 221980399 in words is "two hundred twenty-one million, nine hundred eighty thousand, three hundred ninety-nine".