21486287793 has 8 divisors (see below), whose sum is σ = 28650584800. Its totient is φ = 14323091328.

The previous prime is 21486287789. The next prime is 21486287857. The reversal of 21486287793 is 39778268412.

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

It is not a de Polignac number, because 21486287793 - 2² = 21486287789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21486287783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228448 + ... + 308481.

It is an arithmetic number, because the mean of its divisors is an integer number (3581323100).

Almost surely, 2^21486287793 is an apocalyptic number.

It is an amenable number.

21486287793 is a deficient number, since it is larger than the sum of its proper divisors (7164297007).

21486287793 is a wasteful number, since it uses less digits than its factorization.

21486287793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550271.

The product of its digits is 8128512, while the sum is 57.

The spelling of 21486287793 in words is "twenty-one billion, four hundred eighty-six million, two hundred eighty-seven thousand, seven hundred ninety-three".