255305031021 has 12 divisors (see below), whose sum is σ = 375731933148. Its totient is φ = 166991969664.

The previous prime is 255305030969. The next prime is 255305031041. The reversal of 255305031021 is 120130503552.

It is a happy number.

255305031021 is a `hidden beast` number, since 2 + 5 + 53 + 0 + 503 + 102 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 69553512900 + 185751518121 = 263730^2 + 430989^2 .

It is not a de Polignac number, because 255305031021 - 2³⁰ = 254231289197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255305031041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 267614860 + ... + 267615813.

It is an arithmetic number, because the mean of its divisors is an integer number (31310994429).

Almost surely, 2^255305031021 is an apocalyptic number.

It is an amenable number.

255305031021 is a deficient number, since it is larger than the sum of its proper divisors (120426902127).

255305031021 is a wasteful number, since it uses less digits than its factorization.

255305031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535230732 (or 535230729 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 255305031021 its reverse (120130503552), we get a palindrome (375435534573).

The spelling of 255305031021 in words is "two hundred fifty-five billion, three hundred five million, thirty-one thousand, twenty-one".