21105414464 has 28 divisors (see below), whose sum is σ = 42032287284. Its totient is φ = 10514601984.

The previous prime is 21105414443. The next prime is 21105414481. The reversal of 21105414464 is 46441450112.

It can be written as a sum of positive squares in 2 ways, for example, as 5978382400 + 15127032064 = 77320^2 + 122992^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21105414464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577529 + ... + 612984.

Almost surely, 2^21105414464 is an apocalyptic number.

It is an amenable number.

21105414464 is a deficient number, since it is larger than the sum of its proper divisors (20926872820).

21105414464 is a wasteful number, since it uses less digits than its factorization.

21105414464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190802 (or 1190792 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21105414464 its reverse (46441450112), we get a palindrome (67546864576).

The spelling of 21105414464 in words is "twenty-one billion, one hundred five million, four hundred fourteen thousand, four hundred sixty-four".