21105316445 has 8 divisors (see below), whose sum is σ = 25327367520. Its totient is φ = 16883594640.

The previous prime is 21105316387. The next prime is 21105316471. The reversal of 21105316445 is 54461350112.

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

It is not a de Polignac number, because 21105316445 - 2¹⁶ = 21105250909 is a prime.

It is a super-3 number, since 3×21105316445³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

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, 92426 + ... + 225284.

It is an arithmetic number, because the mean of its divisors is an integer number (3165920940).

Almost surely, 2^21105316445 is an apocalyptic number.

It is an amenable number.

21105316445 is a deficient number, since it is larger than the sum of its proper divisors (4222051075).

21105316445 is a wasteful number, since it uses less digits than its factorization.

21105316445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164635.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21105316445 its reverse (54461350112), we get a palindrome (75566666557).

The spelling of 21105316445 in words is "twenty-one billion, one hundred five million, three hundred sixteen thousand, four hundred forty-five".