6421158432 has 144 divisors (see below), whose sum is σ = 19856910528. Its totient is φ = 1956441600.

The previous prime is 6421158389. The next prime is 6421158439. The reversal of 6421158432 is 2348511246.

It is a happy number.

6421158432 is a `hidden beast` number, since 6 + 4 + 211 + 5 + 8 + 432 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 (6421158439) 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 23 ways as a sum of consecutive naturals, for example, 377307 + ... + 393957.

It is an arithmetic number, because the mean of its divisors is an integer number (137895212).

Almost surely, 2^6421158432 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 6421158432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9928455264).

6421158432 is an abundant number, since it is smaller than the sum of its proper divisors (13435752096).

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

6421158432 is a wasteful number, since it uses less digits than its factorization.

6421158432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16783 (or 16772 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 6421158432 is about 80132.1310836047. The cubic root of 6421158432 is about 1858.6792983170.

Adding to 6421158432 its reverse (2348511246), we get a palindrome (8769669678).

The spelling of 6421158432 in words is "six billion, four hundred twenty-one million, one hundred fifty-eight thousand, four hundred thirty-two".