221055839 has 4 divisors (see below), whose sum is σ = 221648856. Its totient is φ = 220462824.

The previous prime is 221055833. The next prime is 221055841. The reversal of 221055839 is 938550122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221055839 - 2¹⁶ = 220990303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221055799 and 221055808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221055833) 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, 295949 + ... + 296694.

It is an arithmetic number, because the mean of its divisors is an integer number (55412214).

Almost surely, 2^221055839 is an apocalyptic number.

221055839 is a deficient number, since it is larger than the sum of its proper divisors (593017).

221055839 is an equidigital number, since it uses as much as digits as its factorization.

221055839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593016.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 221055839 is about 14867.9466975100. The cubic root of 221055839 is about 604.6452752898.

The spelling of 221055839 in words is "two hundred twenty-one million, fifty-five thousand, eight hundred thirty-nine".