6421347900 has 216 divisors, whose sum is σ = 22771292544. Its totient is φ = 1556625600.

The previous prime is 6421347883. The next prime is 6421347923. The reversal of 6421347900 is 97431246.

6421347900 is a `hidden beast` number, since 642 + 1 + 3 + 4 + 7 + 9 + 0 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 255289 + ... + 279311.

Almost surely, 2^6421347900 is an apocalyptic number.

6421347900 is a gapful number since it is divisible by the number (60) 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 6421347900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11385646272).

6421347900 is an abundant number, since it is smaller than the sum of its proper divisors (16349944644).

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

6421347900 is a wasteful number, since it uses less digits than its factorization.

6421347900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24063 (or 24044 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 6421347900 is about 80133.3132972798. The cubic root of 6421347900 is about 1858.6975793789.

The spelling of 6421347900 in words is "six billion, four hundred twenty-one million, three hundred forty-seven thousand, nine hundred".