505252421 has 4 divisors (see below), whose sum is σ = 505513344. Its totient is φ = 504991500.

The previous prime is 505252417. The next prime is 505252441. The reversal of 505252421 is 124252505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505252421 - 2² = 505252417 is a prime.

It is a super-2 number, since 2×505252421² = 510560017852722482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505252411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127535 + ... + 131436.

It is an arithmetic number, because the mean of its divisors is an integer number (126378336).

Almost surely, 2^505252421 is an apocalyptic number.

It is an amenable number.

505252421 is a deficient number, since it is larger than the sum of its proper divisors (260923).

505252421 is a wasteful number, since it uses less digits than its factorization.

505252421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260922.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 505252421 is about 22477.8206461392. The cubic root of 505252421 is about 796.4700834573.

The spelling of 505252421 in words is "five hundred five million, two hundred fifty-two thousand, four hundred twenty-one".