255015321234021 has 6 divisors (see below), whose sum is σ = 368355464004710. Its totient is φ = 170010214156008.

The previous prime is 255015321233999. The next prime is 255015321234031. The reversal of 255015321234021 is 120432123510552.

255015321234021 is a `hidden beast` number, since 2 + 5 + 50 + 1 + 53 + 212 + 340 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 129567817121796 + 125447504112225 = 11382786^2 + 11200335^2 .

It is not a de Polignac number, because 255015321234021 - 2²¹ = 255015319136869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255015321234031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14167517846326 + ... + 14167517846343.

Almost surely, 2^{255015321234021} is an apocalyptic number.

It is an amenable number.

255015321234021 is a deficient number, since it is larger than the sum of its proper divisors (113340142770689).

255015321234021 is a wasteful number, since it uses less digits than its factorization.

255015321234021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28335035692675 (or 28335035692672 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 255015321234021 its reverse (120432123510552), we get a palindrome (375447444744573).

The spelling of 255015321234021 in words is "two hundred fifty-five trillion, fifteen billion, three hundred twenty-one million, two hundred thirty-four thousand, twenty-one".