21033109998 has 16 divisors (see below), whose sum is σ = 46740244560. Its totient is φ = 7011036648.

The previous prime is 21033109997. The next prime is 21033110011. The reversal of 21033109998 is 89990133012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033109997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194750965 + ... + 194751072.

It is an arithmetic number, because the mean of its divisors is an integer number (2921265285).

Almost surely, 2^21033109998 is an apocalyptic number.

21033109998 is an abundant number, since it is smaller than the sum of its proper divisors (25707134562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21033109998 is a wasteful number, since it uses less digits than its factorization.

21033109998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389502048 (or 389502042 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 21033109998 in words is "twenty-one billion, thirty-three million, one hundred nine thousand, nine hundred ninety-eight".