21549290548 has 24 divisors (see below), whose sum is σ = 39419174592. Its totient is φ = 10288295424.

The previous prime is 21549290537. The next prime is 21549290611. The reversal of 21549290548 is 84509294512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149890 + ... + 256057.

It is an arithmetic number, because the mean of its divisors is an integer number (1642465608).

Almost surely, 2^21549290548 is an apocalyptic number.

It is an amenable number.

21549290548 is a deficient number, since it is larger than the sum of its proper divisors (17869884044).

21549290548 is a wasteful number, since it uses less digits than its factorization.

21549290548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406551 (or 406549 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 21549290548 in words is "twenty-one billion, five hundred forty-nine million, two hundred ninety thousand, five hundred forty-eight".