6421434330 has 64 divisors (see below), whose sum is σ = 16213219200. Its totient is φ = 1625299200.

The previous prime is 6421434319. The next prime is 6421434337. The reversal of 6421434330 is 334341246.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (6421434337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11221 + ... + 113880.

It is an arithmetic number, because the mean of its divisors is an integer number (253331550).

Almost surely, 2^6421434330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6421434330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8106609600).

6421434330 is an abundant number, since it is smaller than the sum of its proper divisors (9791784870).

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

6421434330 is a wasteful number, since it uses less digits than its factorization.

6421434330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125199.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 6421434330 is about 80133.8525842855. The cubic root of 6421434330 is about 1858.7059185685.

Adding to 6421434330 its reverse (334341246), we get a palindrome (6755775576).

The spelling of 6421434330 in words is "six billion, four hundred twenty-one million, four hundred thirty-four thousand, three hundred thirty".