505031121221 has 48 divisors (see below), whose sum is σ = 623568093120. Its totient is φ = 403749158400.

The previous prime is 505031121197. The next prime is 505031121233. The reversal of 505031121221 is 122121130505.

It is not a de Polignac number, because 505031121221 - 2¹⁸ = 505030859077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505031123221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5163050 + ... + 5259956.

It is an arithmetic number, because the mean of its divisors is an integer number (12991001940).

Almost surely, 2^505031121221 is an apocalyptic number.

It is an amenable number.

505031121221 is a deficient number, since it is larger than the sum of its proper divisors (118536971899).

505031121221 is a wasteful number, since it uses less digits than its factorization.

505031121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97026 (or 96995 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 505031121221 its reverse (122121130505), we get a palindrome (627152251726).

The spelling of 505031121221 in words is "five hundred five billion, thirty-one million, one hundred twenty-one thousand, two hundred twenty-one".