2021216533465 has 16 divisors (see below), whose sum is σ = 2477128158720. Its totient is φ = 1582529425600.

The previous prime is 2021216533459. The next prime is 2021216533601. The reversal of 2021216533465 is 5643356121202.

It is not a de Polignac number, because 2021216533465 - 2¹⁷ = 2021216402393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12070815 + ... + 12237115.

It is an arithmetic number, because the mean of its divisors is an integer number (154820509920).

Almost surely, 2^{2021216533465} is an apocalyptic number.

It is an amenable number.

2021216533465 is a deficient number, since it is larger than the sum of its proper divisors (455911625255).

2021216533465 is a wasteful number, since it uses less digits than its factorization.

2021216533465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218072.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 2021216533465 in words is "two trillion, twenty-one billion, two hundred sixteen million, five hundred thirty-three thousand, four hundred sixty-five".