505323021 has 8 divisors (see below), whose sum is σ = 770016064. Its totient is φ = 288756000.

The previous prime is 505323017. The next prime is 505323029. The reversal of 505323021 is 120323505.

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

It is not a de Polignac number, because 505323021 - 2² = 505323017 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: 24063001 = 505323021 / (5 + 0 + 5 + 3 + 2 + 3 + 0 + 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 (505323029) 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, 12031480 + ... + 12031521.

It is an arithmetic number, because the mean of its divisors is an integer number (96252008).

Almost surely, 2^505323021 is an apocalyptic number.

It is an amenable number.

505323021 is a deficient number, since it is larger than the sum of its proper divisors (264693043).

505323021 is a wasteful number, since it uses less digits than its factorization.

505323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24063011.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 505323021 is about 22479.3910282285. The cubic root of 505323021 is about 796.5071792182.

Adding to 505323021 its reverse (120323505), we get a palindrome (625646526).

The spelling of 505323021 in words is "five hundred five million, three hundred twenty-three thousand, twenty-one".