21105414465 has 8 divisors (see below), whose sum is σ = 33768663168. Its totient is φ = 11256221040.

The previous prime is 21105414443. The next prime is 21105414481. The reversal of 21105414465 is 56441450112.

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

It is not a de Polignac number, because 21105414465 - 2⁵ = 21105414433 is a prime.

It is a super-3 number, since 3×21105414465³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703513801 + ... + 703513830.

It is an arithmetic number, because the mean of its divisors is an integer number (4221082896).

Almost surely, 2^21105414465 is an apocalyptic number.

It is an amenable number.

21105414465 is a deficient number, since it is larger than the sum of its proper divisors (12663248703).

21105414465 is a wasteful number, since it uses less digits than its factorization.

21105414465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407027639.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 21105414465 its reverse (56441450112), we get a palindrome (77546864577).

The spelling of 21105414465 in words is "twenty-one billion, one hundred five million, four hundred fourteen thousand, four hundred sixty-five".