515305350021 has 48 divisors (see below), whose sum is σ = 913871693952. Its totient is φ = 251944535040.

The previous prime is 515305349939. The next prime is 515305350041. The reversal of 515305350021 is 120053503515.

It is not a de Polignac number, because 515305350021 - 2¹⁸ = 515305087877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515305350041) 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, 5921400 + ... + 6007793.

It is an arithmetic number, because the mean of its divisors is an integer number (19038993624).

Almost surely, 2^515305350021 is an apocalyptic number.

515305350021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

515305350021 is a deficient number, since it is larger than the sum of its proper divisors (398566343931).

515305350021 is a wasteful number, since it uses less digits than its factorization.

515305350021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11929242 (or 11929231 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 30.

Adding to 515305350021 its reverse (120053503515), we get a palindrome (635358853536).

The spelling of 515305350021 in words is "five hundred fifteen billion, three hundred five million, three hundred fifty thousand, twenty-one".