21698184080 has 40 divisors (see below), whose sum is σ = 50458826232. Its totient is φ = 8677458944.

The previous prime is 21698184049. The next prime is 21698184103. The reversal of 21698184080 is 8048189612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7478098576 + 14220085504 = 86476^2 + 119248^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21698184080² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 396122 + ... + 447558.

Almost surely, 2^21698184080 is an apocalyptic number.

21698184080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21698184080 is an abundant number, since it is smaller than the sum of its proper divisors (28760642152).

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

21698184080 is a wasteful number, since it uses less digits than its factorization.

21698184080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56723 (or 56717 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 47.

The spelling of 21698184080 in words is "twenty-one billion, six hundred ninety-eight million, one hundred eighty-four thousand, eighty".