21216054465345 has 8 divisors (see below), whose sum is σ = 33945687144576. Its totient is φ = 11315229048176.

The previous prime is 21216054465329. The next prime is 21216054465383. The reversal of 21216054465345 is 54356445061212.

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

It is a cyclic number.

It is not a de Polignac number, because 21216054465345 - 2⁴ = 21216054465329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21216054465294 and 21216054465303.

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, 707201815497 + ... + 707201815526.

It is an arithmetic number, because the mean of its divisors is an integer number (4243210893072).

Almost surely, 2^{21216054465345} is an apocalyptic number.

It is an amenable number.

21216054465345 is a deficient number, since it is larger than the sum of its proper divisors (12729632679231).

21216054465345 is a wasteful number, since it uses less digits than its factorization.

21216054465345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414403631031.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 21216054465345 in words is "twenty-one trillion, two hundred sixteen billion, fifty-four million, four hundred sixty-five thousand, three hundred forty-five".