21696421198 has 16 divisors (see below), whose sum is σ = 32926608000. Its totient is φ = 10721308536.

The previous prime is 21696421189. The next prime is 21696421199. The reversal of 21696421198 is 89112469612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21696421199) 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, 2740 + ... + 208327.

It is an arithmetic number, because the mean of its divisors is an integer number (2057913000).

Almost surely, 2^21696421198 is an apocalyptic number.

21696421198 is a deficient number, since it is larger than the sum of its proper divisors (11230186802).

21696421198 is a wasteful number, since it uses less digits than its factorization.

21696421198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211671.

The product of its digits is 373248, while the sum is 49.

The spelling of 21696421198 in words is "twenty-one billion, six hundred ninety-six million, four hundred twenty-one thousand, one hundred ninety-eight".