21954447359 has 8 divisors (see below), whose sum is σ = 23658041232. Its totient is φ = 20252966400.

The previous prime is 21954447337. The next prime is 21954447367. The reversal of 21954447359 is 95374445912.

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-21954447359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21954447359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954447379) 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, 506609 + ... + 548234.

It is an arithmetic number, because the mean of its divisors is an integer number (2957255154).

Almost surely, 2^21954447359 is an apocalyptic number.

21954447359 is a deficient number, since it is larger than the sum of its proper divisors (1703593873).

21954447359 is a wasteful number, since it uses less digits than its factorization.

21954447359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056457.

The product of its digits is 5443200, while the sum is 53.

The spelling of 21954447359 in words is "twenty-one billion, nine hundred fifty-four million, four hundred forty-seven thousand, three hundred fifty-nine".