21554054454535 has 16 divisors (see below), whose sum is σ = 25985827684512. Its totient is φ = 17162734320000.

The previous prime is 21554054454529. The next prime is 21554054454539. The reversal of 21554054454535 is 53545445045512.

It is a de Polignac number, because none of the positive numbers 2^k-21554054454535 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 (21554054454539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6965841 + ... + 9572410.

It is an arithmetic number, because the mean of its divisors is an integer number (1624114230282).

Almost surely, 2^{21554054454535} is an apocalyptic number.

21554054454535 is a deficient number, since it is larger than the sum of its proper divisors (4431773229977).

21554054454535 is a wasteful number, since it uses less digits than its factorization.

21554054454535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16539474.

The product of its (nonzero) digits is 24000000, while the sum is 52.

The spelling of 21554054454535 in words is "twenty-one trillion, five hundred fifty-four billion, fifty-four million, four hundred fifty-four thousand, five hundred thirty-five".