21944324357 has 8 divisors (see below), whose sum is σ = 22900133760. Its totient is φ = 20988657360.

The previous prime is 21944324333. The next prime is 21944324371. The reversal of 21944324357 is 75342344912.

It is a happy number.

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

It is not a de Polignac number, because 21944324357 - 2⁶ = 21944324293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944324327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385319 + ... + 438587.

It is an arithmetic number, because the mean of its divisors is an integer number (2862516720).

Almost surely, 2^21944324357 is an apocalyptic number.

It is an amenable number.

21944324357 is a deficient number, since it is larger than the sum of its proper divisors (955809403).

21944324357 is a wasteful number, since it uses less digits than its factorization.

21944324357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71203.

The product of its digits is 725760, while the sum is 44.

The spelling of 21944324357 in words is "twenty-one billion, nine hundred forty-four million, three hundred twenty-four thousand, three hundred fifty-seven".