6421146920 has 32 divisors (see below), whose sum is σ = 14449881600. Its totient is φ = 2568049728.

The previous prime is 6421146889. The next prime is 6421146929. The reversal of 6421146920 is 296411246.

It is a super-2 number, since 2×6421146920² = 82462255536450972800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6421146929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436241 + ... + 450719.

It is an arithmetic number, because the mean of its divisors is an integer number (451558800).

Almost surely, 2^6421146920 is an apocalyptic number.

It is an amenable number.

6421146920 is an abundant number, since it is smaller than the sum of its proper divisors (8028734680).

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

6421146920 is a wasteful number, since it uses less digits than its factorization.

6421146920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25577 (or 25573 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 6421146920 is about 80132.0592522119. The cubic root of 6421146920 is about 1858.6781875554.

The spelling of 6421146920 in words is "six billion, four hundred twenty-one million, one hundred forty-six thousand, nine hundred twenty".