6499379237421 has 16 divisors (see below), whose sum is σ = 9903877491200. Its totient is φ = 3713907926448.

The previous prime is 6499379237419. The next prime is 6499379237423. The reversal of 6499379237421 is 1247329739946.

It is an interprime number because it is at equal distance from previous prime (6499379237419) and next prime (6499379237423).

It is not a de Polignac number, because 6499379237421 - 2¹ = 6499379237419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6499379237423) 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 15 ways as a sum of consecutive naturals, for example, 2852550 + ... + 4597368.

It is an arithmetic number, because the mean of its divisors is an integer number (618992343200).

Almost surely, 2^{6499379237421} is an apocalyptic number.

It is an amenable number.

6499379237421 is a deficient number, since it is larger than the sum of its proper divisors (3404498253779).

6499379237421 is a wasteful number, since it uses less digits than its factorization.

6499379237421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922208.

The product of its digits is 123451776, while the sum is 66.

The spelling of 6499379237421 in words is "six trillion, four hundred ninety-nine billion, three hundred seventy-nine million, two hundred thirty-seven thousand, four hundred twenty-one".