515423132021 has 16 divisors (see below), whose sum is σ = 621803328000. Its totient is φ = 426557066544.

The previous prime is 515423131981. The next prime is 515423132033. The reversal of 515423132021 is 120231324515.

It is not a de Polignac number, because 515423132021 - 2⁶ = 515423131957 is a prime.

It is a super-2 number, since 2×515423132021² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515423132041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25898525 + ... + 25918418.

It is an arithmetic number, because the mean of its divisors is an integer number (38862708000).

Almost surely, 2^515423132021 is an apocalyptic number.

It is an amenable number.

515423132021 is a deficient number, since it is larger than the sum of its proper divisors (106380195979).

515423132021 is an equidigital number, since it uses as much as digits as its factorization.

515423132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51816993 (or 51816979 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 515423132021 its reverse (120231324515), we get a palindrome (635654456536).

The spelling of 515423132021 in words is "five hundred fifteen billion, four hundred twenty-three million, one hundred thirty-two thousand, twenty-one".