255122445421 has 4 divisors (see below), whose sum is σ = 255486386844. Its totient is φ = 254758504000.

The previous prime is 255122445371. The next prime is 255122445427. The reversal of 255122445421 is 124544221552.

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 157410562500 + 97711882921 = 396750^2 + 312589^2 .

It is a cyclic number.

It is not a de Polignac number, because 255122445421 - 2⁷ = 255122445293 is a prime.

It is a super-3 number, since 3×255122445421³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255122445427) 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 3 ways as a sum of consecutive naturals, for example, 181969660 + ... + 181971061.

It is an arithmetic number, because the mean of its divisors is an integer number (63871596711).

Almost surely, 2^255122445421 is an apocalyptic number.

It is an amenable number.

255122445421 is a deficient number, since it is larger than the sum of its proper divisors (363941423).

255122445421 is an equidigital number, since it uses as much as digits as its factorization.

255122445421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363941422.

The product of its digits is 128000, while the sum is 37.

Adding to 255122445421 its reverse (124544221552), we get a palindrome (379666666973).

The spelling of 255122445421 in words is "two hundred fifty-five billion, one hundred twenty-two million, four hundred forty-five thousand, four hundred twenty-one".