6421902912 has 252 divisors, whose sum is σ = 19810177296. Its totient is φ = 2062609920.

The previous prime is 6421902901. The next prime is 6421902913. The reversal of 6421902912 is 2192091246.

6421902912 is a `hidden beast` number, since 642 + 1 + 9 + 0 + 2 + 9 + 1 + 2 = 666.

It is a super-2 number, since 2×6421902912² = 82481674022308159488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (6421902913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13078987 + ... + 13079477.

Almost surely, 2^6421902912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6421902912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9905088648).

6421902912 is an abundant number, since it is smaller than the sum of its proper divisors (13388274384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6421902912 is an equidigital number, since it uses as much as digits as its factorization.

6421902912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 6421902912 is about 80136.7762765636. The cubic root of 6421902912 is about 1858.7511283512.

The spelling of 6421902912 in words is "six billion, four hundred twenty-one million, nine hundred two thousand, nine hundred twelve".