21500489198 has 8 divisors (see below), whose sum is σ = 32308019208. Its totient is φ = 10731149464.

The previous prime is 21500489147. The next prime is 21500489207. The reversal of 21500489198 is 89198400512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9546161 + ... + 9548412.

It is an arithmetic number, because the mean of its divisors is an integer number (4038502401).

Almost surely, 2^21500489198 is an apocalyptic number.

21500489198 is a deficient number, since it is larger than the sum of its proper divisors (10807530010).

21500489198 is a wasteful number, since it uses less digits than its factorization.

21500489198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19095138.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 21500489198 in words is "twenty-one billion, five hundred million, four hundred eighty-nine thousand, one hundred ninety-eight".