21216543454422 has 24 divisors (see below), whose sum is σ = 47452054178880. Its totient is φ = 6844046275440.

The previous prime is 21216543454361. The next prime is 21216543454423. The reversal of 21216543454422 is 22445434561212.

21216543454422 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 6 + 54 + 34 + 544 + 22 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216543454423) 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 11 ways as a sum of consecutive naturals, for example, 19011239097 + ... + 19011240212.

It is an arithmetic number, because the mean of its divisors is an integer number (1977168924120).

Almost surely, 2^{21216543454422} is an apocalyptic number.

21216543454422 is an abundant number, since it is smaller than the sum of its proper divisors (26235510724458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21216543454422 is a wasteful number, since it uses less digits than its factorization.

21216543454422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38022479348 (or 38022479345 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 45.

The spelling of 21216543454422 in words is "twenty-one trillion, two hundred sixteen billion, five hundred forty-three million, four hundred fifty-four thousand, four hundred twenty-two".