21386883804 has 96 divisors (see below), whose sum is σ = 59620942080. Its totient is φ = 5880921600.

The previous prime is 21386883781. The next prime is 21386883823. The reversal of 21386883804 is 40838868312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4377 + ... + 206864.

It is an arithmetic number, because the mean of its divisors is an integer number (621051480).

Almost surely, 2^21386883804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21386883804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29810471040).

21386883804 is an abundant number, since it is smaller than the sum of its proper divisors (38234058276).

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

21386883804 is a wasteful number, since it uses less digits than its factorization.

21386883804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211331 (or 211329 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 51.

The spelling of 21386883804 in words is "twenty-one billion, three hundred eighty-six million, eight hundred eighty-three thousand, eight hundred four".