6452520021 has 30 divisors (see below), whose sum is σ = 9906672930. Its totient is φ = 4185346464.

The previous prime is 6452520013. The next prime is 6452520043. The reversal of 6452520021 is 1200252546.

6452520021 is a `hidden beast` number, since 6 + 452 + 5 + 200 + 2 + 1 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 2124195921 + 4328324100 = 46089^2 + 65790^2 .

It is not a de Polignac number, because 6452520021 - 2³ = 6452520013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6452520121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 81795 + ... + 139983.

It is an arithmetic number, because the mean of its divisors is an integer number (330222431).

Almost surely, 2^6452520021 is an apocalyptic number.

It is an amenable number.

6452520021 is a deficient number, since it is larger than the sum of its proper divisors (3454152909).

6452520021 is an equidigital number, since it uses as much as digits as its factorization.

6452520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58275 (or 58229 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 6452520021 is about 80327.5794543817. The cubic root of 6452520021 is about 1861.7003779543.

Adding to 6452520021 its reverse (1200252546), we get a palindrome (7652772567).

The spelling of 6452520021 in words is "six billion, four hundred fifty-two million, five hundred twenty thousand, twenty-one".