21498469768 has 16 divisors (see below), whose sum is σ = 40580167500. Its totient is φ = 10677091776.

The previous prime is 21498469723. The next prime is 21498469777. The reversal of 21498469768 is 86796489412.

It can be written as a sum of positive squares in 2 ways, for example, as 21368007684 + 130462084 = 146178^2 + 11422^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9016623 + ... + 9019006.

Almost surely, 2^21498469768 is an apocalyptic number.

It is an amenable number.

21498469768 is a deficient number, since it is larger than the sum of its proper divisors (19081697732).

21498469768 is a wasteful number, since it uses less digits than its factorization.

21498469768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18035784 (or 18035780 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 64.

The spelling of 21498469768 in words is "twenty-one billion, four hundred ninety-eight million, four hundred sixty-nine thousand, seven hundred sixty-eight".