21849041787 has 8 divisors (see below), whose sum is σ = 29196939600. Its totient is φ = 14533585920.

The previous prime is 21849041749. The next prime is 21849041803. The reversal of 21849041787 is 78714094812.

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

It is not a de Polignac number, because 21849041787 - 2⁶ = 21849041723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21849041987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8108914 + ... + 8111607.

It is an arithmetic number, because the mean of its divisors is an integer number (3649617450).

Almost surely, 2^21849041787 is an apocalyptic number.

21849041787 is a deficient number, since it is larger than the sum of its proper divisors (7347897813).

21849041787 is a wasteful number, since it uses less digits than its factorization.

21849041787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16220973.

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 21849041787 in words is "twenty-one billion, eight hundred forty-nine million, forty-one thousand, seven hundred eighty-seven".