21203405104 has 40 divisors (see below), whose sum is σ = 47415277728. Its totient is φ = 8997196800.

The previous prime is 21203405063. The next prime is 21203405147. The reversal of 21203405104 is 40150430212.

It is an unprimeable number.

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, 925897 + ... + 948520.

Almost surely, 2^21203405104 is an apocalyptic number.

It is an amenable number.

21203405104 is an abundant number, since it is smaller than the sum of its proper divisors (26211872624).

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

21203405104 is a wasteful number, since it uses less digits than its factorization.

21203405104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874533 (or 1874527 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21203405104 its reverse (40150430212), we get a palindrome (61353835316).

The spelling of 21203405104 in words is "twenty-one billion, two hundred three million, four hundred five thousand, one hundred four".