21304578080 has 48 divisors (see below), whose sum is σ = 51040995264. Its totient is φ = 8401800960.

The previous prime is 21304578073. The next prime is 21304578083. The reversal of 21304578080 is 8087540312.

It is not an unprimeable number, because it can be changed into a prime (21304578083) 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, 926342 + ... + 949061.

It is an arithmetic number, because the mean of its divisors is an integer number (1063354068).

Almost surely, 2^21304578080 is an apocalyptic number.

21304578080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304578080 is an abundant number, since it is smaller than the sum of its proper divisors (29736417184).

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

21304578080 is a wasteful number, since it uses less digits than its factorization.

21304578080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875489 (or 1875481 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 21304578080 in words is "twenty-one billion, three hundred four million, five hundred seventy-eight thousand, eighty".