255512421 has 16 divisors (see below), whose sum is σ = 384955200. Its totient is φ = 167453424.

The previous prime is 255512419. The next prime is 255512423. The reversal of 255512421 is 124215552.

It is an interprime number because it is at equal distance from previous prime (255512419) and next prime (255512423).

It is not a de Polignac number, because 255512421 - 2¹ = 255512419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255512423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78606 + ... + 81791.

It is an arithmetic number, because the mean of its divisors is an integer number (24059700).

Almost surely, 2^255512421 is an apocalyptic number.

It is an amenable number.

255512421 is a deficient number, since it is larger than the sum of its proper divisors (129442779).

255512421 is a wasteful number, since it uses less digits than its factorization.

255512421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160465 (or 160459 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 255512421 is about 15984.7558942888. The cubic root of 255512421 is about 634.5570482270.

Adding to 255512421 its reverse (124215552), we get a palindrome (379727973).

It can be divided in two parts, 25551 and 2421, that added together give a palindrome (27972).

The spelling of 255512421 in words is "two hundred fifty-five million, five hundred twelve thousand, four hundred twenty-one".