21720049941 has 8 divisors (see below), whose sum is σ = 29072752704. Its totient is φ = 14423690240.

The previous prime is 21720049927. The next prime is 21720049943. The reversal of 21720049941 is 14994002712.

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 21720049941 - 2⁵ = 21720049909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21720049941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21720049943) 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, 14084865 + ... + 14086406.

It is an arithmetic number, because the mean of its divisors is an integer number (3634094088).

Almost surely, 2^21720049941 is an apocalyptic number.

It is an amenable number.

21720049941 is a deficient number, since it is larger than the sum of its proper divisors (7352702763).

21720049941 is a wasteful number, since it uses less digits than its factorization.

21720049941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28171531.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 21720049941 in words is "twenty-one billion, seven hundred twenty million, forty-nine thousand, nine hundred forty-one".