21321000998 has 24 divisors (see below), whose sum is σ = 35252640504. Its totient is φ = 9591360000.

The previous prime is 21321000997. The next prime is 21321001003. The reversal of 21321000998 is 89900012312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321000997) 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 11 ways as a sum of consecutive naturals, for example, 155498 + ... + 258498.

It is an arithmetic number, because the mean of its divisors is an integer number (1468860021).

Almost surely, 2^21321000998 is an apocalyptic number.

21321000998 is a deficient number, since it is larger than the sum of its proper divisors (13931639506).

21321000998 is a wasteful number, since it uses less digits than its factorization.

21321000998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103208 (or 103111 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 21321000998 in words is "twenty-one billion, three hundred twenty-one million, nine hundred ninety-eight", and thus it is an aban number.