6421027218986 has 16 divisors (see below), whose sum is σ = 9813559173768. Its totient is φ = 3149844422400.

The previous prime is 6421027218953. The next prime is 6421027218997. The reversal of 6421027218986 is 6898127201246.

It can be written as a sum of positive squares in 4 ways, for example, as 6375468450961 + 45558768025 = 2524969^2 + 213445^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2760806 + ... + 4523726.

Almost surely, 2^{6421027218986} is an apocalyptic number.

6421027218986 is a deficient number, since it is larger than the sum of its proper divisors (3392531954782).

6421027218986 is a wasteful number, since it uses less digits than its factorization.

6421027218986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797337.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 6421027218986 in words is "six trillion, four hundred twenty-one billion, twenty-seven million, two hundred eighteen thousand, nine hundred eighty-six".