255421130251421 has 4 divisors (see below), whose sum is σ = 255422457327612. Its totient is φ = 255419803175232.

The previous prime is 255421130251381. The next prime is 255421130251451. The reversal of 255421130251421 is 124152031124552.

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 181721480728921 + 73699649522500 = 13480411^2 + 8584850^2 .

It is a cyclic number.

It is not a de Polignac number, because 255421130251421 - 2¹⁰ = 255421130250397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255421130251451) 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, 663249350 + ... + 663634343.

It is an arithmetic number, because the mean of its divisors is an integer number (63855614331903).

Almost surely, 2^{255421130251421} is an apocalyptic number.

It is an amenable number.

255421130251421 is a deficient number, since it is larger than the sum of its proper divisors (1327076191).

255421130251421 is a wasteful number, since it uses less digits than its factorization.

255421130251421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327076190.

The product of its (nonzero) digits is 96000, while the sum is 38.

Adding to 255421130251421 its reverse (124152031124552), we get a palindrome (379573161375973).

The spelling of 255421130251421 in words is "two hundred fifty-five trillion, four hundred twenty-one billion, one hundred thirty million, two hundred fifty-one thousand, four hundred twenty-one".