21398388298 has 12 divisors (see below), whose sum is σ = 37338004242. Its totient is φ = 9170737800.

The previous prime is 21398388289. The next prime is 21398388299. The reversal of 21398388298 is 89288389312.

It can be written as a sum of positive squares in only one way, i.e., 13716391689 + 7681996609 = 117117^2 + 87647^2 .

It is not an unprimeable number, because it can be changed into a prime (21398388299) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109175353 + ... + 109175548.

Almost surely, 2^21398388298 is an apocalyptic number.

21398388298 is a deficient number, since it is larger than the sum of its proper divisors (15939615944).

21398388298 is a wasteful number, since it uses less digits than its factorization.

21398388298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218350917 (or 218350910 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 61.

The spelling of 21398388298 in words is "twenty-one billion, three hundred ninety-eight million, three hundred eighty-eight thousand, two hundred ninety-eight".