6421117535 has 24 divisors (see below), whose sum is σ = 9013492080. Its totient is φ = 4378424064.

The previous prime is 6421117523. The next prime is 6421117567. The reversal of 6421117535 is 5357111246.

It is a happy number.

It is not a de Polignac number, because 6421117535 - 2⁶ = 6421117471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a junction number, because it is equal to n+sod(n) for n = 6421117495 and 6421117504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29354 + ... + 117063.

It is an arithmetic number, because the mean of its divisors is an integer number (375562170).

Almost surely, 2^6421117535 is an apocalyptic number.

6421117535 is a deficient number, since it is larger than the sum of its proper divisors (2592374545).

6421117535 is a wasteful number, since it uses less digits than its factorization.

6421117535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146615 (or 146608 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 6421117535 is about 80131.8758984213. The cubic root of 6421117535 is about 1858.6753522705.

The spelling of 6421117535 in words is "six billion, four hundred twenty-one million, one hundred seventeen thousand, five hundred thirty-five".