21216042165434 has 8 divisors (see below), whose sum is σ = 31824084056160. Its totient is φ = 10608014146716.

The previous prime is 21216042165427. The next prime is 21216042165469. The reversal of 21216042165434 is 43456124061212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21216042165391 and 21216042165400.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2223947 + ... + 6883169.

It is an arithmetic number, because the mean of its divisors is an integer number (3978010507020).

Almost surely, 2^{21216042165434} is an apocalyptic number.

21216042165434 is a deficient number, since it is larger than the sum of its proper divisors (10608041890726).

21216042165434 is a wasteful number, since it uses less digits than its factorization.

21216042165434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6936004.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 21216042165434 in words is "twenty-one trillion, two hundred sixteen billion, forty-two million, one hundred sixty-five thousand, four hundred thirty-four".