505393770021 has 16 divisors (see below), whose sum is σ = 770713112064. Its totient is φ = 288575463024.

The previous prime is 505393769963. The next prime is 505393770041. The reversal of 505393770021 is 120077393505.

It is not a de Polignac number, because 505393770021 - 2⁷ = 505393769893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505393770041) 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, 9179275 + ... + 9234168.

It is an arithmetic number, because the mean of its divisors is an integer number (48169569504).

Almost surely, 2^505393770021 is an apocalyptic number.

It is an amenable number.

505393770021 is a deficient number, since it is larger than the sum of its proper divisors (265319342043).

505393770021 is a wasteful number, since it uses less digits than its factorization.

505393770021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18414760.

The product of its (nonzero) digits is 198450, while the sum is 42.

The spelling of 505393770021 in words is "five hundred five billion, three hundred ninety-three million, seven hundred seventy thousand, twenty-one".