6421611312 has 120 divisors (see below), whose sum is σ = 19238768640. Its totient is φ = 2071448640.

The previous prime is 6421611311. The next prime is 6421611341. The reversal of 6421611312 is 2131161246.

It is a happy number.

6421611312 is a `hidden beast` number, since 6 + 42 + 1 + 611 + 3 + 1 + 2 = 666.

It is a super-2 number, since 2×6421611312² = 82474183684812722688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421611311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93889 + ... + 147167.

It is an arithmetic number, because the mean of its divisors is an integer number (160323072).

Almost surely, 2^6421611312 is an apocalyptic number.

6421611312 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6421611312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9619384320).

6421611312 is an abundant number, since it is smaller than the sum of its proper divisors (12817157328).

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

6421611312 is a wasteful number, since it uses less digits than its factorization.

6421611312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53333 (or 53315 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 6421611312 is about 80134.9568665261. The cubic root of 6421611312 is about 1858.7229944247.

Adding to 6421611312 its reverse (2131161246), we get a palindrome (8552772558).

The spelling of 6421611312 in words is "six billion, four hundred twenty-one million, six hundred eleven thousand, three hundred twelve".