21486802209 has 8 divisors (see below), whose sum is σ = 28734083040. Its totient is φ = 14282028096.

The previous prime is 21486802189. The next prime is 21486802219. The reversal of 21486802209 is 90220868412.

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

It is not a de Polignac number, because 21486802209 - 2¹⁷ = 21486671137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21486802219) by changing a digit.

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, 10625499 + ... + 10627520.

It is an arithmetic number, because the mean of its divisors is an integer number (3591760380).

Almost surely, 2^21486802209 is an apocalyptic number.

It is an amenable number.

21486802209 is a deficient number, since it is larger than the sum of its proper divisors (7247280831).

21486802209 is a wasteful number, since it uses less digits than its factorization.

21486802209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21253359.

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 21486802209 in words is "twenty-one billion, four hundred eighty-six million, eight hundred two thousand, two hundred nine".