21321313198 has 8 divisors (see below), whose sum is σ = 33863262192. Its totient is φ = 10033559136.

The previous prime is 21321313193. The next prime is 21321313217. The reversal of 21321313198 is 89131312312.

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 627097447 = 21321313198 / (2 + 1 + 3 + 2 + 1 + 3 + 1 + 3 + 1 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321313193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313548690 + ... + 313548757.

It is an arithmetic number, because the mean of its divisors is an integer number (4232907774).

Almost surely, 2^21321313198 is an apocalyptic number.

21321313198 is a deficient number, since it is larger than the sum of its proper divisors (12541948994).

21321313198 is a wasteful number, since it uses less digits than its factorization.

21321313198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627097466.

The product of its digits is 7776, while the sum is 34.

The spelling of 21321313198 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirteen thousand, one hundred ninety-eight".