21730428580 has 24 divisors (see below), whose sum is σ = 52153028928. Its totient is φ = 7450432608.

The previous prime is 21730428571. The next prime is 21730428593. The reversal of 21730428580 is 8582403712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77608534 + ... + 77608813.

It is an arithmetic number, because the mean of its divisors is an integer number (2173042872).

Almost surely, 2^21730428580 is an apocalyptic number.

21730428580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21730428580 is an abundant number, since it is smaller than the sum of its proper divisors (30422600348).

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

21730428580 is a wasteful number, since it uses less digits than its factorization.

21730428580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155217363 (or 155217361 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 21730428580 in words is "twenty-one billion, seven hundred thirty million, four hundred twenty-eight thousand, five hundred eighty".