6420213529 has 4 divisors (see below), whose sum is σ = 6422034276. Its totient is φ = 6418392784.

The previous prime is 6420213511. The next prime is 6420213577. The reversal of 6420213529 is 9253120246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5294745225 + 1125468304 = 72765^2 + 33548^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420213529 - 2¹¹ = 6420211481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6420213494 and 6420213503.

It is not an unprimeable number, because it can be changed into a prime (6420213229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905074 + ... + 912139.

It is an arithmetic number, because the mean of its divisors is an integer number (1605508569).

Almost surely, 2^6420213529 is an apocalyptic number.

It is an amenable number.

6420213529 is a deficient number, since it is larger than the sum of its proper divisors (1820747).

6420213529 is a wasteful number, since it uses less digits than its factorization.

6420213529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820746.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 6420213529 is about 80126.2349608416. The cubic root of 6420213529 is about 1858.5881227750.

The spelling of 6420213529 in words is "six billion, four hundred twenty million, two hundred thirteen thousand, five hundred twenty-nine".