255200421 has 8 divisors (see below), whose sum is σ = 388876864. Its totient is φ = 145828800.

The previous prime is 255200417. The next prime is 255200453. The reversal of 255200421 is 124002552.

It is a happy number.

255200421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255200421 - 2² = 255200417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 12152401 = 255200421 / (2 + 5 + 5 + 2 + 0 + 0 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255200411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6076180 + ... + 6076221.

It is an arithmetic number, because the mean of its divisors is an integer number (48609608).

Almost surely, 2^255200421 is an apocalyptic number.

255200421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255200421 is a deficient number, since it is larger than the sum of its proper divisors (133676443).

255200421 is a wasteful number, since it uses less digits than its factorization.

255200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12152411.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 255200421 is about 15974.9936150222. The cubic root of 255200421 is about 634.2986623051.

Adding to 255200421 its reverse (124002552), we get a palindrome (379202973).

The spelling of 255200421 in words is "two hundred fifty-five million, two hundred thousand, four hundred twenty-one".