21854899505 has 16 divisors (see below), whose sum is σ = 26640852480. Its totient is φ = 17208275328.

The previous prime is 21854899459. The next prime is 21854899513. The reversal of 21854899505 is 50599845812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21854899505 - 2¹² = 21854895409 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 112334 + ... + 237336.

It is an arithmetic number, because the mean of its divisors is an integer number (1665053280).

Almost surely, 2^21854899505 is an apocalyptic number.

It is an amenable number.

21854899505 is a deficient number, since it is larger than the sum of its proper divisors (4785952975).

21854899505 is a wasteful number, since it uses less digits than its factorization.

21854899505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125560.

The product of its (nonzero) digits is 5184000, while the sum is 56.

The spelling of 21854899505 in words is "twenty-one billion, eight hundred fifty-four million, eight hundred ninety-nine thousand, five hundred five".