21755708484718 has 16 divisors (see below), whose sum is σ = 35144302520880. Its totient is φ = 10040963155776.

The previous prime is 21755708484637. The next prime is 21755708484739. The reversal of 21755708484718 is 81748480755712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3531055 + ... + 7481962.

It is an arithmetic number, because the mean of its divisors is an integer number (2196518907555).

Almost surely, 2^{21755708484718} is an apocalyptic number.

21755708484718 is a deficient number, since it is larger than the sum of its proper divisors (13388594036162).

21755708484718 is a wasteful number, since it uses less digits than its factorization.

21755708484718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11089011.

The product of its (nonzero) digits is 140492800, while the sum is 67.

The spelling of 21755708484718 in words is "twenty-one trillion, seven hundred fifty-five billion, seven hundred eight million, four hundred eighty-four thousand, seven hundred eighteen".