21261101003344 has 20 divisors (see below), whose sum is σ = 41198507635680. Its totient is φ = 10629228065120.

The previous prime is 21261101003321. The next prime is 21261101003347. The reversal of 21261101003344 is 44330010116212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261101003347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82519642 + ... + 82776889.

It is an arithmetic number, because the mean of its divisors is an integer number (2059925381784).

Almost surely, 2^{21261101003344} is an apocalyptic number.

It is an amenable number.

21261101003344 is a deficient number, since it is larger than the sum of its proper divisors (19937406632336).

21261101003344 is a wasteful number, since it uses less digits than its factorization.

21261101003344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165304578 (or 165304572 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21261101003344 its reverse (44330010116212), we get a palindrome (65591111119556).

The spelling of 21261101003344 in words is "twenty-one trillion, two hundred sixty-one billion, one hundred one million, three thousand, three hundred forty-four".