21648119689 has 9 divisors (see below), whose sum is σ = 25183704717. Its totient is φ = 18554648364.

The previous prime is 21648119687. The next prime is 21648119693. The reversal of 21648119689 is 98691184612.

The square root of 21648119689 is 147133.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 21648119689 - 2¹ = 21648119687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21648119687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1019422 + ... + 1040440.

It is an arithmetic number, because the mean of its divisors is an integer number (2798189413).

Almost surely, 2^21648119689 is an apocalyptic number.

21648119689 is the 147133-rd square number.

21648119689 is the 73567-th centered octagonal number.

It is an amenable number.

21648119689 is a deficient number, since it is larger than the sum of its proper divisors (3535585028).

21648119689 is an frugal number, since it uses more digits than its factorization.

21648119689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42052 (or 21026 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The spelling of 21648119689 in words is "twenty-one billion, six hundred forty-eight million, one hundred nineteen thousand, six hundred eighty-nine".