21554357744 has 40 divisors (see below), whose sum is σ = 42442463568. Its totient is φ = 10601902080.

The previous prime is 21554357717. The next prime is 21554357761. The reversal of 21554357744 is 44775345512.

It is a congruent number.

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, 798224 + ... + 824784.

Almost surely, 2^21554357744 is an apocalyptic number.

It is an amenable number.

21554357744 is a deficient number, since it is larger than the sum of its proper divisors (20888105824).

21554357744 is a wasteful number, since it uses less digits than its factorization.

21554357744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27393 (or 27387 counting only the distinct ones).

The product of its digits is 2352000, while the sum is 47.

The spelling of 21554357744 in words is "twenty-one billion, five hundred fifty-four million, three hundred fifty-seven thousand, seven hundred forty-four".