255201421 has 4 divisors (see below), whose sum is σ = 264001500. Its totient is φ = 246401344.

The previous prime is 255201409. The next prime is 255201437. The reversal of 255201421 is 124102552.

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 155900196 + 99301225 = 12486^2 + 9965^2 .

It is a cyclic number.

It is not a de Polignac number, because 255201421 - 2²⁷ = 120983693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255201392 and 255201401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255201451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4399996 + ... + 4400053.

It is an arithmetic number, because the mean of its divisors is an integer number (66000375).

Almost surely, 2^255201421 is an apocalyptic number.

It is an amenable number.

255201421 is a deficient number, since it is larger than the sum of its proper divisors (8800079).

255201421 is an equidigital number, since it uses as much as digits as its factorization.

255201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8800078.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 255201421 is about 15975.0249139086. The cubic root of 255201421 is about 634.2994908014.

Adding to 255201421 its reverse (124102552), we get a palindrome (379303973).

The spelling of 255201421 in words is "two hundred fifty-five million, two hundred one thousand, four hundred twenty-one".