21398033404 has 24 divisors (see below), whose sum is σ = 41172461568. Its totient is φ = 9649790640.

The previous prime is 21398033381. The next prime is 21398033407. The reversal of 21398033404 is 40433089312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21398033407) 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, 1909054 + ... + 1920229.

It is an arithmetic number, because the mean of its divisors is an integer number (1715519232).

Almost surely, 2^21398033404 is an apocalyptic number.

It is an amenable number.

21398033404 is a deficient number, since it is larger than the sum of its proper divisors (19774428164).

21398033404 is a wasteful number, since it uses less digits than its factorization.

21398033404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829425 (or 3829423 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21398033404 in words is "twenty-one billion, three hundred ninety-eight million, thirty-three thousand, four hundred four".