21668746127 has 8 divisors (see below), whose sum is σ = 24773014656. Its totient is φ = 18566660952.

The previous prime is 21668746117. The next prime is 21668746129. The reversal of 21668746127 is 72164786612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21668746127 - 2⁴ = 21668746111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21668746129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524513 + ... + 564314.

It is an arithmetic number, because the mean of its divisors is an integer number (3096626832).

Almost surely, 2^21668746127 is an apocalyptic number.

21668746127 is a deficient number, since it is larger than the sum of its proper divisors (3104268529).

21668746127 is a wasteful number, since it uses less digits than its factorization.

21668746127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091677.

The product of its digits is 1354752, while the sum is 50.

The spelling of 21668746127 in words is "twenty-one billion, six hundred sixty-eight million, seven hundred forty-six thousand, one hundred twenty-seven".