21791528143 has 8 divisors (see below), whose sum is σ = 27168658560. Its totient is φ = 16980411480.

The previous prime is 21791528141. The next prime is 21791528189. The reversal of 21791528143 is 34182519712.

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 21791528143 - 2¹ = 21791528141 is a prime.

It is a super-2 number, since 2×21791528143² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21791528143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21791528141) 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, 141503353 + ... + 141503506.

It is an arithmetic number, because the mean of its divisors is an integer number (3396082320).

Almost surely, 2^21791528143 is an apocalyptic number.

21791528143 is a deficient number, since it is larger than the sum of its proper divisors (5377130417).

21791528143 is a wasteful number, since it uses less digits than its factorization.

21791528143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283006877.

The product of its digits is 120960, while the sum is 43.

The spelling of 21791528143 in words is "twenty-one billion, seven hundred ninety-one million, five hundred twenty-eight thousand, one hundred forty-three".