21125829743 has 8 divisors (see below), whose sum is σ = 21204583296. Its totient is φ = 21047146200.

The previous prime is 21125829737. The next prime is 21125829821. The reversal of 21125829743 is 34792852112.

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 21125829743 - 2¹⁶ = 21125764207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21125829694 and 21125829703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125829713) 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, 631508 + ... + 664118.

It is an arithmetic number, because the mean of its divisors is an integer number (2650572912).

Almost surely, 2^21125829743 is an apocalyptic number.

21125829743 is a deficient number, since it is larger than the sum of its proper divisors (78753553).

21125829743 is a wasteful number, since it uses less digits than its factorization.

21125829743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35005.

The product of its digits is 241920, while the sum is 44.

The spelling of 21125829743 in words is "twenty-one billion, one hundred twenty-five million, eight hundred twenty-nine thousand, seven hundred forty-three".