21751436849671 has 8 divisors (see below), whose sum is σ = 22305987267344. Its totient is φ = 21199100207040.

The previous prime is 21751436849627. The next prime is 21751436849677. The reversal of 21751436849671 is 17694863415712.

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

It is a cyclic number.

It is not a de Polignac number, because 21751436849671 - 2⁷ = 21751436849543 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 (21751436849677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553423860 + ... + 553463161.

It is an arithmetic number, because the mean of its divisors is an integer number (2788248408418).

Almost surely, 2^{21751436849671} is an apocalyptic number.

21751436849671 is a deficient number, since it is larger than the sum of its proper divisors (554550417673).

21751436849671 is a wasteful number, since it uses less digits than its factorization.

21751436849671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106887521.

The product of its digits is 60963840, while the sum is 64.

The spelling of 21751436849671 in words is "twenty-one trillion, seven hundred fifty-one billion, four hundred thirty-six million, eight hundred forty-nine thousand, six hundred seventy-one".