21516427416345 has 8 divisors (see below), whose sum is σ = 34426283866176. Its totient is φ = 11475427955376.

The previous prime is 21516427416317. The next prime is 21516427416353. The reversal of 21516427416345 is 54361472461512.

It is a happy number.

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

It is not a de Polignac number, because 21516427416345 - 2²⁸ = 21516158980889 is a prime.

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, 717214247197 + ... + 717214247226.

It is an arithmetic number, because the mean of its divisors is an integer number (4303285483272).

Almost surely, 2^{21516427416345} is an apocalyptic number.

It is an amenable number.

21516427416345 is a deficient number, since it is larger than the sum of its proper divisors (12909856449831).

21516427416345 is a wasteful number, since it uses less digits than its factorization.

21516427416345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434428494431.

The product of its digits is 4838400, while the sum is 51.

Adding to 21516427416345 its reverse (54361472461512), we get a palindrome (75877899877857).

The spelling of 21516427416345 in words is "twenty-one trillion, five hundred sixteen billion, four hundred twenty-seven million, four hundred sixteen thousand, three hundred forty-five".