21698184085 has 8 divisors (see below), whose sum is σ = 26055530496. Its totient is φ = 17346740880.

The previous prime is 21698184049. The next prime is 21698184103. The reversal of 21698184085 is 58048189612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21698184085 - 2³¹ = 19550700437 is a prime.

It is a super-2 number, since 2×21698184085² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467709 + ... + 1482418.

It is an arithmetic number, because the mean of its divisors is an integer number (3256941312).

Almost surely, 2^21698184085 is an apocalyptic number.

It is an amenable number.

21698184085 is a deficient number, since it is larger than the sum of its proper divisors (4357346411).

21698184085 is a wasteful number, since it uses less digits than its factorization.

21698184085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951603.

The product of its (nonzero) digits is 1105920, while the sum is 52.

The spelling of 21698184085 in words is "twenty-one billion, six hundred ninety-eight million, one hundred eighty-four thousand, eighty-five".