21216016053515 has 8 divisors (see below), whose sum is σ = 25487165723328. Its totient is φ = 16954181870080.

The previous prime is 21216016053497. The next prime is 21216016053527. The reversal of 21216016053515 is 51535061061212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21216016053515 - 2³⁰ = 21214942311691 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2328866582 + ... + 2328875691.

It is an arithmetic number, because the mean of its divisors is an integer number (3185895715416).

Almost surely, 2^{21216016053515} is an apocalyptic number.

21216016053515 is a deficient number, since it is larger than the sum of its proper divisors (4271149669813).

21216016053515 is an equidigital number, since it uses as much as digits as its factorization.

21216016053515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4657743189.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 21216016053515 in words is "twenty-one trillion, two hundred sixteen billion, sixteen million, fifty-three thousand, five hundred fifteen".