255122021 has 32 divisors (see below), whose sum is σ = 325036800. Its totient is φ = 194503680.

The previous prime is 255122011. The next prime is 255122029. The reversal of 255122021 is 120221552.

It is a happy number.

It is not a de Polignac number, because 255122021 - 2¹⁰ = 255120997 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 255121984 and 255122002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255122029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 948275 + ... + 948543.

It is an arithmetic number, because the mean of its divisors is an integer number (10157400).

Almost surely, 2^255122021 is an apocalyptic number.

It is an amenable number.

255122021 is a deficient number, since it is larger than the sum of its proper divisors (69914779).

255122021 is a wasteful number, since it uses less digits than its factorization.

255122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 255122021 is about 15972.5395914363. The cubic root of 255122021 is about 634.2337014556.

Adding to 255122021 its reverse (120221552), we get a palindrome (375343573).

The spelling of 255122021 in words is "two hundred fifty-five million, one hundred twenty-two thousand, twenty-one".