6421729701 has 24 divisors (see below), whose sum is σ = 8862072192. Its totient is φ = 4136193600.

The previous prime is 6421729679. The next prime is 6421729711. The reversal of 6421729701 is 1079271246.

It is not a de Polignac number, because 6421729701 - 2³⁰ = 5347987877 is a prime.

It is a super-2 number, since 2×6421729701² = 82477224705411098802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6421729701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421729711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2192500 + ... + 2195426.

It is an arithmetic number, because the mean of its divisors is an integer number (369253008).

Almost surely, 2^6421729701 is an apocalyptic number.

It is an amenable number.

6421729701 is a deficient number, since it is larger than the sum of its proper divisors (2440342491).

6421729701 is a wasteful number, since it uses less digits than its factorization.

6421729701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753 (or 3722 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 6421729701 is about 80135.6955482387. The cubic root of 6421729701 is about 1858.7344168437.

The spelling of 6421729701 in words is "six billion, four hundred twenty-one million, seven hundred twenty-nine thousand, seven hundred one".