21826638548 has 24 divisors (see below), whose sum is σ = 44874348960. Its totient is φ = 9158029920.

The previous prime is 21826638539. The next prime is 21826638551. The reversal of 21826638548 is 84583662812.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21826638548.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19078658 + ... + 19079801.

It is an arithmetic number, because the mean of its divisors is an integer number (1869764540).

Almost surely, 2^21826638548 is an apocalyptic number.

It is an amenable number.

21826638548 is an abundant number, since it is smaller than the sum of its proper divisors (23047710412).

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

21826638548 is a wasteful number, since it uses less digits than its factorization.

21826638548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38158487 (or 38158485 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 53.

The spelling of 21826638548 in words is "twenty-one billion, eight hundred twenty-six million, six hundred thirty-eight thousand, five hundred forty-eight".