21866084193 has 8 divisors (see below), whose sum is σ = 29422254400. Its totient is φ = 14443651728.

The previous prime is 21866084167. The next prime is 21866084197. The reversal of 21866084193 is 39148066812.

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

It is not a de Polignac number, because 21866084193 - 2¹⁸ = 21865822049 is a prime.

It is a super-2 number, since 2×21866084193² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21866084197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33434053 + ... + 33434706.

It is an arithmetic number, because the mean of its divisors is an integer number (3677781800).

Almost surely, 2^21866084193 is an apocalyptic number.

It is an amenable number.

21866084193 is a deficient number, since it is larger than the sum of its proper divisors (7556170207).

21866084193 is a wasteful number, since it uses less digits than its factorization.

21866084193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66868871.

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 21866084193 in words is "twenty-one billion, eight hundred sixty-six million, eighty-four thousand, one hundred ninety-three".