21986298641 has 8 divisors (see below), whose sum is σ = 22775246400. Its totient is φ = 21199404240.

The previous prime is 21986298623. The next prime is 21986298731. The reversal of 21986298641 is 14689268912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21986298641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21986298041) 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, 491525 + ... + 534386.

It is an arithmetic number, because the mean of its divisors is an integer number (2846905800).

Almost surely, 2^21986298641 is an apocalyptic number.

It is an amenable number.

21986298641 is a deficient number, since it is larger than the sum of its proper divisors (788947759).

21986298641 is a wasteful number, since it uses less digits than its factorization.

21986298641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026679.

The product of its digits is 2985984, while the sum is 56.

The spelling of 21986298641 in words is "twenty-one billion, nine hundred eighty-six million, two hundred ninety-eight thousand, six hundred forty-one".