21127185893 has 8 divisors (see below), whose sum is σ = 23137522560. Its totient is φ = 19131796480.

The previous prime is 21127185889. The next prime is 21127185899. The reversal of 21127185893 is 39858172112.

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 21127185893 - 2² = 21127185889 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 (21127185899) 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, 3733853 + ... + 3739506.

It is an arithmetic number, because the mean of its divisors is an integer number (2892190320).

Almost surely, 2^21127185893 is an apocalyptic number.

It is an amenable number.

21127185893 is a deficient number, since it is larger than the sum of its proper divisors (2010336667).

21127185893 is a wasteful number, since it uses less digits than its factorization.

21127185893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7473627.

The product of its digits is 241920, while the sum is 47.

The spelling of 21127185893 in words is "twenty-one billion, one hundred twenty-seven million, one hundred eighty-five thousand, eight hundred ninety-three".