6421102420 has 12 divisors (see below), whose sum is σ = 13484315124. Its totient is φ = 2568440960.

The previous prime is 6421102417. The next prime is 6421102439. The reversal of 6421102420 is 242011246.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1137847824 + 5283254596 = 33732^2 + 72686^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6421102391 and 6421102400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160527541 + ... + 160527580.

It is an arithmetic number, because the mean of its divisors is an integer number (1123692927).

Almost surely, 2^6421102420 is an apocalyptic number.

It is an amenable number.

6421102420 is an abundant number, since it is smaller than the sum of its proper divisors (7063212704).

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

6421102420 is a wasteful number, since it uses less digits than its factorization.

6421102420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321055130 (or 321055128 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 6421102420 is about 80131.7815850865. The cubic root of 6421102420 is about 1858.6738938588.

Adding to 6421102420 its reverse (242011246), we get a palindrome (6663113666).

The spelling of 6421102420 in words is "six billion, four hundred twenty-one million, one hundred two thousand, four hundred twenty".