21344131073 has 2 divisors, whose sum is σ = 21344131074. Its totient is φ = 21344131072.

The previous prime is 21344130937. The next prime is 21344131079. The reversal of 21344131073 is 37013144312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15949669264 + 5394461809 = 126292^2 + 73447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344131073 is a prime.

It is a super-2 number, since 2×21344131073² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21344131079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672065536 + 10672065537.

It is an arithmetic number, because the mean of its divisors is an integer number (10672065537).

Almost surely, 2^21344131073 is an apocalyptic number.

It is an amenable number.

21344131073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344131073 is an equidigital number, since it uses as much as digits as its factorization.

21344131073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

Adding to 21344131073 its reverse (37013144312), we get a palindrome (58357275385).

The spelling of 21344131073 in words is "twenty-one billion, three hundred forty-four million, one hundred thirty-one thousand, seventy-three".