6520070421 has 6 divisors (see below), whose sum is σ = 9417879510. Its totient is φ = 4346713608.

The previous prime is 6520070413. The next prime is 6520070449. The reversal of 6520070421 is 1240700256.

6520070421 is a `hidden beast` number, since 652 + 0 + 0 + 7 + 0 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5731247025 + 788823396 = 75705^2 + 28086^2 .

It is not a de Polignac number, because 6520070421 - 2³ = 6520070413 is a prime.

It is a super-2 number, since 2×6520070421² = 85022636589598234482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520070411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 362226126 + ... + 362226143.

It is an arithmetic number, because the mean of its divisors is an integer number (1569646585).

Almost surely, 2^6520070421 is an apocalyptic number.

It is an amenable number.

6520070421 is a deficient number, since it is larger than the sum of its proper divisors (2897809089).

6520070421 is a wasteful number, since it uses less digits than its factorization.

6520070421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724452275 (or 724452272 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 6520070421 is about 80746.9530137206. The cubic root of 6520070421 is about 1868.1744527123.

Adding to 6520070421 its reverse (1240700256), we get a palindrome (7760770677).

The spelling of 6520070421 in words is "six billion, five hundred twenty million, seventy thousand, four hundred twenty-one".