255355432421020 has 24 divisors (see below), whose sum is σ = 536262972016464. Its totient is φ = 102139017933696.

The previous prime is 255355432420961. The next prime is 255355432421021. The reversal of 255355432421020 is 20124234553552.

It is a happy number.

It is a super-2 number, since 2×255355432421020² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255355432421021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196525942 + ... + 197821021.

It is an arithmetic number, because the mean of its divisors is an integer number (22344290500686).

Almost surely, 2^{255355432421020} is an apocalyptic number.

255355432421020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255355432421020 is an abundant number, since it is smaller than the sum of its proper divisors (280907539595444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255355432421020 is a wasteful number, since it uses less digits than its factorization.

255355432421020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394379349 (or 394379347 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 43.

Adding to 255355432421020 its reverse (20124234553552), we get a palindrome (275479666974572).

The spelling of 255355432421020 in words is "two hundred fifty-five trillion, three hundred fifty-five billion, four hundred thirty-two million, four hundred twenty-one thousand, twenty".