6513420021 has 8 divisors (see below), whose sum is σ = 8685860160. Its totient is φ = 4341629952.

The previous prime is 6513420019. The next prime is 6513420029. The reversal of 6513420021 is 1200243156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6513420021 - 2¹ = 6513420019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6513419973 and 6513420000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6513420029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138636 + ... + 179573.

It is an arithmetic number, because the mean of its divisors is an integer number (1085732520).

Almost surely, 2^6513420021 is an apocalyptic number.

It is an amenable number.

6513420021 is a deficient number, since it is larger than the sum of its proper divisors (2172440139).

6513420021 is a wasteful number, since it uses less digits than its factorization.

6513420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325035.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 6513420021 is about 80705.7620061914. The cubic root of 6513420021 is about 1867.5390641800.

Adding to 6513420021 its reverse (1200243156), we get a palindrome (7713663177).

The spelling of 6513420021 in words is "six billion, five hundred thirteen million, four hundred twenty thousand, twenty-one".