21216234454341 has 16 divisors (see below), whose sum is σ = 29340178421760. Its totient is φ = 13620770287040.

The previous prime is 21216234454339. The next prime is 21216234454357. The reversal of 21216234454341 is 14345443261212.

It is a cyclic number.

It is not a de Polignac number, because 21216234454341 - 2¹ = 21216234454339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21216234454293 and 21216234454302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216234452341) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 318327990 + ... + 318394631.

It is an arithmetic number, because the mean of its divisors is an integer number (1833761151360).

Almost surely, 2^{21216234454341} is an apocalyptic number.

It is an amenable number.

21216234454341 is a deficient number, since it is larger than the sum of its proper divisors (8123943967419).

21216234454341 is a wasteful number, since it uses less digits than its factorization.

21216234454341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636723036.

The product of its digits is 552960, while the sum is 42.

The spelling of 21216234454341 in words is "twenty-one trillion, two hundred sixteen billion, two hundred thirty-four million, four hundred fifty-four thousand, three hundred forty-one".