21043592187 has 8 divisors (see below), whose sum is σ = 28068024336. Its totient is φ = 14024110752.

The previous prime is 21043592173. The next prime is 21043592201. The reversal of 21043592187 is 78129534012.

It is an interprime number because it is at equal distance from previous prime (21043592173) and next prime (21043592201).

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

It is not a de Polignac number, because 21043592187 - 2¹⁴ = 21043575803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21043591187) by changing a digit.

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, 1227748 + ... + 1244769.

It is an arithmetic number, because the mean of its divisors is an integer number (3508503042).

Almost surely, 2^21043592187 is an apocalyptic number.

21043592187 is a deficient number, since it is larger than the sum of its proper divisors (7024432149).

21043592187 is a wasteful number, since it uses less digits than its factorization.

21043592187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475357.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 21043592187 in words is "twenty-one billion, forty-three million, five hundred ninety-two thousand, one hundred eighty-seven".