21758687216453 has 24 divisors (see below), whose sum is σ = 24210857798400. Its totient is φ = 19538219242080.

The previous prime is 21758687216363. The next prime is 21758687216459. The reversal of 21758687216453 is 35461278685712.

It is a happy number.

It is not a de Polignac number, because 21758687216453 - 2¹⁰ = 21758687215429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21758687216453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21758687216459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2604068 + ... + 7092146.

It is an arithmetic number, because the mean of its divisors is an integer number (1008785741600).

Almost surely, 2^{21758687216453} is an apocalyptic number.

It is an amenable number.

21758687216453 is a deficient number, since it is larger than the sum of its proper divisors (2452170581947).

21758687216453 is a wasteful number, since it uses less digits than its factorization.

21758687216453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488593 (or 4488582 counting only the distinct ones).

The product of its digits is 135475200, while the sum is 65.

The spelling of 21758687216453 in words is "twenty-one trillion, seven hundred fifty-eight billion, six hundred eighty-seven million, two hundred sixteen thousand, four hundred fifty-three".