21108802193 has 8 divisors (see below), whose sum is σ = 21809738496. Its totient is φ = 20409116400.

The previous prime is 21108802163. The next prime is 21108802219. The reversal of 21108802193 is 39120880112.

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 21108802193 - 2¹² = 21108798097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21108802163) 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, 278246 + ... + 345887.

It is an arithmetic number, because the mean of its divisors is an integer number (2726217312).

Almost surely, 2^21108802193 is an apocalyptic number.

It is an amenable number.

21108802193 is a deficient number, since it is larger than the sum of its proper divisors (700936303).

21108802193 is a wasteful number, since it uses less digits than its factorization.

21108802193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625255.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 21108802193 in words is "twenty-one billion, one hundred eight million, eight hundred two thousand, one hundred ninety-three".