255021312 has 288 divisors, whose sum is σ = 865347840. Its totient is φ = 64880640.

The previous prime is 255021311. The next prime is 255021313. The reversal of 255021312 is 213120552.

It is an interprime number because it is at equal distance from previous prime (255021311) and next prime (255021313).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (255021311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2865364 + ... + 2865452.

It is an arithmetic number, because the mean of its divisors is an integer number (3004680).

Almost surely, 2^255021312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (432673920).

255021312 is an abundant number, since it is smaller than the sum of its proper divisors (610326528).

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

255021312 is a wasteful number, since it uses less digits than its factorization.

255021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 255021312 is about 15969.3867133337. The cubic root of 255021312 is about 634.1502362337.

Adding to 255021312 its reverse (213120552), we get a palindrome (468141864).

The spelling of 255021312 in words is "two hundred fifty-five million, twenty-one thousand, three hundred twelve".