21602426300544 has 128 divisors (see below), whose sum is σ = 57824468956800. Its totient is φ = 7145424674816.

The previous prime is 21602426300503. The next prime is 21602426300561. The reversal of 21602426300544 is 44500362420612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25803277 + ... + 26627315.

It is an arithmetic number, because the mean of its divisors is an integer number (451753663725).

Almost surely, 2^{21602426300544} is an apocalyptic number.

21602426300544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21602426300544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28912234478400).

21602426300544 is an abundant number, since it is smaller than the sum of its proper divisors (36222042656256).

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

21602426300544 is a wasteful number, since it uses less digits than its factorization.

21602426300544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824582 (or 824570 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 21602426300544 in words is "twenty-one trillion, six hundred two billion, four hundred twenty-six million, three hundred thousand, five hundred forty-four".