21998166286 has 8 divisors (see below), whose sum is σ = 33002306064. Its totient is φ = 10997397600.

The previous prime is 21998166283. The next prime is 21998166293. The reversal of 21998166286 is 68266189912.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21998166286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21998166283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826395 + ... + 852598.

It is an arithmetic number, because the mean of its divisors is an integer number (4125288258).

Almost surely, 2^21998166286 is an apocalyptic number.

21998166286 is a deficient number, since it is larger than the sum of its proper divisors (11004139778).

21998166286 is a wasteful number, since it uses less digits than its factorization.

21998166286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685546.

The product of its digits is 4478976, while the sum is 58.

The spelling of 21998166286 in words is "twenty-one billion, nine hundred ninety-eight million, one hundred sixty-six thousand, two hundred eighty-six".