21747835080 has 144 divisors (see below), whose sum is σ = 71087849820. Its totient is φ = 5766112512.

The previous prime is 21747835073. The next prime is 21747835091. The reversal of 21747835080 is 8053874712.

21747835080 is a `hidden beast` number, since 2 + 1 + 74 + 78 + 3 + 508 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20420981604 + 1326853476 = 142902^2 + 36426^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 46569007 + ... + 46569473.

Almost surely, 2^21747835080 is an apocalyptic number.

21747835080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21747835080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35543924910).

21747835080 is an abundant number, since it is smaller than the sum of its proper divisors (49340014740).

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

21747835080 is a wasteful number, since it uses less digits than its factorization.

21747835080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228 (or 754 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 21747835080 in words is "twenty-one billion, seven hundred forty-seven million, eight hundred thirty-five thousand, eighty".