21821984741 has 8 divisors (see below), whose sum is σ = 21960990720. Its totient is φ = 21683041632.

The previous prime is 21821984693. The next prime is 21821984749. The reversal of 21821984741 is 14748912812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21821984741 - 2³⁰ = 20748242917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21821984749) 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, 821321 + ... + 847473.

It is an arithmetic number, because the mean of its divisors is an integer number (2745123840).

Almost surely, 2^21821984741 is an apocalyptic number.

It is an amenable number.

21821984741 is a deficient number, since it is larger than the sum of its proper divisors (139005979).

21821984741 is a wasteful number, since it uses less digits than its factorization.

21821984741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31435.

The product of its digits is 258048, while the sum is 47.

The spelling of 21821984741 in words is "twenty-one billion, eight hundred twenty-one million, nine hundred eighty-four thousand, seven hundred forty-one".