21100508493 has 8 divisors (see below), whose sum is σ = 28134773856. Its totient is φ = 14066624400.

The previous prime is 21100508467. The next prime is 21100508503. The reversal of 21100508493 is 39480500112.

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

It is not a de Polignac number, because 21100508493 - 2⁸ = 21100508237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100508413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79758 + ... + 220368.

It is an arithmetic number, because the mean of its divisors is an integer number (3516846732).

Almost surely, 2^21100508493 is an apocalyptic number.

It is an amenable number.

21100508493 is a deficient number, since it is larger than the sum of its proper divisors (7034265363).

21100508493 is a wasteful number, since it uses less digits than its factorization.

21100508493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190635.

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 21100508493 in words is "twenty-one billion, one hundred million, five hundred eight thousand, four hundred ninety-three".