21698184086 has 4 divisors (see below), whose sum is σ = 32547276132. Its totient is φ = 10849092042.

The previous prime is 21698184049. The next prime is 21698184103. The reversal of 21698184086 is 68048189612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21698184086² (a number of 21 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 5424546020 + ... + 5424546023.

It is an arithmetic number, because the mean of its divisors is an integer number (8136819033).

Almost surely, 2^21698184086 is an apocalyptic number.

21698184086 is a deficient number, since it is larger than the sum of its proper divisors (10849092046).

21698184086 is a wasteful number, since it uses less digits than its factorization.

21698184086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10849092045.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 21698184086 in words is "twenty-one billion, six hundred ninety-eight million, one hundred eighty-four thousand, eighty-six".