21648797547 has 16 divisors (see below), whose sum is σ = 31094249760. Its totient is φ = 13318566912.

The previous prime is 21648797531. The next prime is 21648797551. The reversal of 21648797547 is 74579784612.

It is not a de Polignac number, because 21648797547 - 2⁴ = 21648797531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21648797557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64329 + ... + 217797.

It is an arithmetic number, because the mean of its divisors is an integer number (1943390610).

Almost surely, 2^21648797547 is an apocalyptic number.

21648797547 is a deficient number, since it is larger than the sum of its proper divisors (9445452213).

21648797547 is a wasteful number, since it uses less digits than its factorization.

21648797547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157102.

The product of its digits is 23708160, while the sum is 60.

The spelling of 21648797547 in words is "twenty-one billion, six hundred forty-eight million, seven hundred ninety-seven thousand, five hundred forty-seven".