21583647005 has 24 divisors (see below), whose sum is σ = 27130940928. Its totient is φ = 16482330656.

The previous prime is 21583646971. The next prime is 21583647073. The reversal of 21583647005 is 50074638512.

It is not a de Polignac number, because 21583647005 - 2¹⁰ = 21583645981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1322324 + ... + 1338546.

It is an arithmetic number, because the mean of its divisors is an integer number (1130455872).

Almost surely, 2^21583647005 is an apocalyptic number.

It is an amenable number.

21583647005 is a deficient number, since it is larger than the sum of its proper divisors (5547293923).

21583647005 is a wasteful number, since it uses less digits than its factorization.

21583647005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16777 (or 16754 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 21583647005 in words is "twenty-one billion, five hundred eighty-three million, six hundred forty-seven thousand, five".