255244432221 has 6 divisors (see below), whose sum is σ = 368686402110. Its totient is φ = 170162954808.

The previous prime is 255244432211. The next prime is 255244432243. The reversal of 255244432221 is 122234442552.

255244432221 is a `hidden beast` number, since 2 + 552 + 44 + 43 + 2 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 158096892996 + 97147539225 = 397614^2 + 311685^2 .

It is a de Polignac number, because none of the positive numbers 2^k-255244432221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255244432211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14180246226 + ... + 14180246243.

It is an arithmetic number, because the mean of its divisors is an integer number (61447733685).

Almost surely, 2^255244432221 is an apocalyptic number.

It is an amenable number.

255244432221 is a deficient number, since it is larger than the sum of its proper divisors (113441969889).

255244432221 is a wasteful number, since it uses less digits than its factorization.

255244432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28360492475 (or 28360492472 counting only the distinct ones).

The product of its digits is 153600, while the sum is 36.

Adding to 255244432221 its reverse (122234442552), we get a palindrome (377478874773).

The spelling of 255244432221 in words is "two hundred fifty-five billion, two hundred forty-four million, four hundred thirty-two thousand, two hundred twenty-one".