21365554425143 has 8 divisors (see below), whose sum is σ = 21550339023360. Its totient is φ = 21181028450400.

The previous prime is 21365554425133. The next prime is 21365554425167. The reversal of 21365554425143 is 34152445556312.

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 21365554425143 - 2¹⁰ = 21365554424119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21365554425091 and 21365554425100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365554425133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64489928 + ... + 64820381.

It is an arithmetic number, because the mean of its divisors is an integer number (2693792377920).

Almost surely, 2^{21365554425143} is an apocalyptic number.

21365554425143 is a deficient number, since it is larger than the sum of its proper divisors (184784598217).

21365554425143 is a wasteful number, since it uses less digits than its factorization.

21365554425143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129311737.

The product of its digits is 8640000, while the sum is 50.

The spelling of 21365554425143 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred fifty-four million, four hundred twenty-five thousand, one hundred forty-three".