21341661044125 has 16 divisors (see below), whose sum is σ = 28201121984880. Its totient is φ = 16069015372800.

The previous prime is 21341661044101. The next prime is 21341661044129. The reversal of 21341661044125 is 52144016614312.

It can be written as a sum of positive squares in 8 ways, for example, as 3760764254361 + 17580896789764 = 1939269^2 + 4192958^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21341661044125 is a prime.

It is a super-2 number, since 2×21341661044125² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341661044129) 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 15 ways as a sum of consecutive naturals, for example, 5021565180 + ... + 5021569429.

It is an arithmetic number, because the mean of its divisors is an integer number (1762570124055).

Almost surely, 2^{21341661044125} is an apocalyptic number.

21341661044125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21341661044125 is a deficient number, since it is larger than the sum of its proper divisors (6859460940755).

21341661044125 is a wasteful number, since it uses less digits than its factorization.

21341661044125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043134641 (or 10043134631 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

Adding to 21341661044125 its reverse (52144016614312), we get a palindrome (73485677658437).

The spelling of 21341661044125 in words is "twenty-one trillion, three hundred forty-one billion, six hundred sixty-one million, forty-four thousand, one hundred twenty-five".