6421980236 has 48 divisors (see below), whose sum is σ = 13586087424. Its totient is φ = 2596530816.

The previous prime is 6421980223. The next prime is 6421980239. The reversal of 6421980236 is 6320891246.

It is a junction number, because it is equal to n+sod(n) for n = 6421980193 and 6421980202.

It is not an unprimeable number, because it can be changed into a prime (6421980239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21290 + ... + 115313.

It is an arithmetic number, because the mean of its divisors is an integer number (283043488).

Almost surely, 2^6421980236 is an apocalyptic number.

It is an amenable number.

6421980236 is an abundant number, since it is smaller than the sum of its proper divisors (7164107188).

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

6421980236 is a wasteful number, since it uses less digits than its factorization.

6421980236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136710 (or 136708 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 6421980236 is about 80137.2587252646. The cubic root of 6421980236 is about 1858.7585885229.

The spelling of 6421980236 in words is "six billion, four hundred twenty-one million, nine hundred eighty thousand, two hundred thirty-six".