505406243021 has 8 divisors (see below), whose sum is σ = 508047727680. Its totient is φ = 502764993792.

The previous prime is 505406243011. The next prime is 505406243029. The reversal of 505406243021 is 120342604505.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505406243021 is a prime.

It is a super-2 number, since 2×505406243021² (a number of 24 digits) 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 (505406243029) 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, 5722826 + ... + 5810468.

It is an arithmetic number, because the mean of its divisors is an integer number (63505965960).

Almost surely, 2^505406243021 is an apocalyptic number.

It is an amenable number.

505406243021 is a deficient number, since it is larger than the sum of its proper divisors (2641484659).

505406243021 is a wasteful number, since it uses less digits than its factorization.

505406243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117715.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 505406243021 its reverse (120342604505), we get a palindrome (625748847526).

The spelling of 505406243021 in words is "five hundred five billion, four hundred six million, two hundred forty-three thousand, twenty-one".