21871835004 has 48 divisors (see below), whose sum is σ = 53302620672. Its totient is φ = 6967152192.

The previous prime is 21871834991. The next prime is 21871835023. The reversal of 21871835004 is 40053817812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265417 + ... + 337919.

It is an arithmetic number, because the mean of its divisors is an integer number (1110471264).

Almost surely, 2^21871835004 is an apocalyptic number.

It is an amenable number.

21871835004 is an abundant number, since it is smaller than the sum of its proper divisors (31430785668).

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

21871835004 is a wasteful number, since it uses less digits than its factorization.

21871835004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73626 (or 73624 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 21871835004 in words is "twenty-one billion, eight hundred seventy-one million, eight hundred thirty-five thousand, four".