21056403348 has 36 divisors (see below), whose sum is σ = 53251822260. Its totient is φ = 7015383936.

The previous prime is 21056403343. The next prime is 21056403367. The reversal of 21056403348 is 84330465012.

21056403348 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 640 + 3 + 3 + 4 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6617497104 + 14438906244 = 81348^2 + 120162^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056403343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66865 + ... + 215832.

It is an arithmetic number, because the mean of its divisors is an integer number (1479217285).

Almost surely, 2^21056403348 is an apocalyptic number.

It is an amenable number.

21056403348 is an abundant number, since it is smaller than the sum of its proper divisors (32195418912).

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

21056403348 is a wasteful number, since it uses less digits than its factorization.

21056403348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284776 (or 284771 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21056403348 in words is "twenty-one billion, fifty-six million, four hundred three thousand, three hundred forty-eight".