255051215250021 has 24 divisors (see below), whose sum is σ = 368660237825880. Its totient is φ = 169917411833856.

The previous prime is 255051215249989. The next prime is 255051215250053. The reversal of 255051215250021 is 120052512150552.

255051215250021 is a `hidden beast` number, since 2 + 5 + 5 + 0 + 5 + 121 + 5 + 2 + 500 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (255051215249989) and next prime (255051215250053).

It can be written as a sum of positive squares in 4 ways, for example, as 207713526552900 + 47337688697121 = 14412270^2 + 6880239^2 .

It is not a de Polignac number, because 255051215250021 - 2⁵ = 255051215249989 is a prime.

It is a super-2 number, since 2×255051215250021² (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 (255051215250061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1071844585 + ... + 1072082513.

It is an arithmetic number, because the mean of its divisors is an integer number (15360843242745).

Almost surely, 2^{255051215250021} is an apocalyptic number.

It is an amenable number.

255051215250021 is a deficient number, since it is larger than the sum of its proper divisors (113609022575859).

255051215250021 is a wasteful number, since it uses less digits than its factorization.

255051215250021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319205 (or 319202 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

The spelling of 255051215250021 in words is "two hundred fifty-five trillion, fifty-one billion, two hundred fifteen million, two hundred fifty thousand, twenty-one".