21968041550 has 96 divisors (see below), whose sum is σ = 51239345472. Its totient is φ = 6821268480.

The previous prime is 21968041549. The next prime is 21968041637. The reversal of 21968041550 is 5514086912.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21968041498 and 21968041507.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 195602 + ... + 286698.

It is an arithmetic number, because the mean of its divisors is an integer number (533743182).

Almost surely, 2^21968041550 is an apocalyptic number.

21968041550 is an abundant number, since it is smaller than the sum of its proper divisors (29271303922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21968041550 is a wasteful number, since it uses less digits than its factorization.

21968041550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91182 (or 91177 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 21968041550 in words is "twenty-one billion, nine hundred sixty-eight million, forty-one thousand, five hundred fifty".