21005095384 has 192 divisors, whose sum is σ = 52161429600. Its totient is φ = 7838208000.

The previous prime is 21005095379. The next prime is 21005095411. The reversal of 21005095384 is 48359050012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38826154 + ... + 38826694.

Almost surely, 2^21005095384 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 21005095384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26080714800).

21005095384 is an abundant number, since it is smaller than the sum of its proper divisors (31156334216).

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

21005095384 is a wasteful number, since it uses less digits than its factorization.

21005095384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994 (or 983 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 21005095384 in words is "twenty-one billion, five million, ninety-five thousand, three hundred eighty-four".