21329282080 has 24 divisors (see below), whose sum is σ = 50390429292. Its totient is φ = 8531712768.

The previous prime is 21329282077. The next prime is 21329282089. The reversal of 21329282080 is 8028292312.

It can be written as a sum of positive squares in 2 ways, for example, as 21202854544 + 126427536 = 145612^2 + 11244^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21329282089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66653847 + ... + 66654166.

Almost surely, 2^21329282080 is an apocalyptic number.

21329282080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21329282080 is an abundant number, since it is smaller than the sum of its proper divisors (29061147212).

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

21329282080 is a wasteful number, since it uses less digits than its factorization.

21329282080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133308028 (or 133308020 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 21329282080 in words is "twenty-one billion, three hundred twenty-nine million, two hundred eighty-two thousand, eighty".