21455452235505 has 16 divisors (see below), whose sum is σ = 34330758758784. Its totient is φ = 11442229464960.

The previous prime is 21455452235443. The next prime is 21455452235507. The reversal of 21455452235505 is 50553225455412.

It is not a de Polignac number, because 21455452235505 - 2¹⁶ = 21455452169969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21455452235507) 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, 42138124 + ... + 42644253.

It is an arithmetic number, because the mean of its divisors is an integer number (2145672422424).

Almost surely, 2^{21455452235505} is an apocalyptic number.

It is an amenable number.

21455452235505 is a deficient number, since it is larger than the sum of its proper divisors (12875306523279).

21455452235505 is a wasteful number, since it uses less digits than its factorization.

21455452235505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84799256.

The product of its (nonzero) digits is 6000000, while the sum is 48.

The spelling of 21455452235505 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty-two million, two hundred thirty-five thousand, five hundred five".