21019934404 has 24 divisors (see below), whose sum is σ = 42045433920. Its totient is φ = 9007350816.

The previous prime is 21019934363. The next prime is 21019934413. The reversal of 21019934404 is 40443991012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185067 + ... + 276205.

It is an arithmetic number, because the mean of its divisors is an integer number (1751893080).

Almost surely, 2^21019934404 is an apocalyptic number.

It is an amenable number.

21019934404 is an abundant number, since it is smaller than the sum of its proper divisors (21025499516).

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

21019934404 is a wasteful number, since it uses less digits than its factorization.

21019934404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99387 (or 99385 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 21019934404 in words is "twenty-one billion, nineteen million, nine hundred thirty-four thousand, four hundred four".