6421425100 has 18 divisors (see below), whose sum is σ = 13934492684. Its totient is φ = 2568570000.

The previous prime is 6421425089. The next prime is 6421425107. The reversal of 6421425100 is 15241246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (6421425107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32107026 + ... + 32107225.

Almost surely, 2^6421425100 is an apocalyptic number.

It is an amenable number.

6421425100 is an abundant number, since it is smaller than the sum of its proper divisors (7513067584).

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

6421425100 is a wasteful number, since it uses less digits than its factorization.

6421425100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64214265 (or 64214258 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 6421425100 is about 80133.7949931238. The cubic root of 6421425100 is about 1858.7050280164.

Adding to 6421425100 its reverse (15241246), we get a palindrome (6436666346).

The spelling of 6421425100 in words is "six billion, four hundred twenty-one million, four hundred twenty-five thousand, one hundred".