21724076004 has 12 divisors (see below), whose sum is σ = 50689510704. Its totient is φ = 7241358664.

The previous prime is 21724075981. The next prime is 21724076021. The reversal of 21724076004 is 40067042712.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905169822 + ... + 905169845.

It is an arithmetic number, because the mean of its divisors is an integer number (4224125892).

Almost surely, 2^21724076004 is an apocalyptic number.

It is an amenable number.

21724076004 is an abundant number, since it is smaller than the sum of its proper divisors (28965434700).

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

21724076004 is a wasteful number, since it uses less digits than its factorization.

21724076004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810339674 (or 1810339672 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The spelling of 21724076004 in words is "twenty-one billion, seven hundred twenty-four million, seventy-six thousand, four".