21344212361 has 2 divisors, whose sum is σ = 21344212362. Its totient is φ = 21344212360.

The previous prime is 21344212327. The next prime is 21344212387. The reversal of 21344212361 is 16321244312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20315085961 + 1029126400 = 142531^2 + 32080^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344212361 - 2⁶ = 21344212297 is a prime.

It is a super-2 number, since 2×21344212361² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21344212261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672106180 + 10672106181.

It is an arithmetic number, because the mean of its divisors is an integer number (10672106181).

Almost surely, 2^21344212361 is an apocalyptic number.

It is an amenable number.

21344212361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344212361 is an equidigital number, since it uses as much as digits as its factorization.

21344212361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

Adding to 21344212361 its reverse (16321244312), we get a palindrome (37665456673).

The spelling of 21344212361 in words is "twenty-one billion, three hundred forty-four million, two hundred twelve thousand, three hundred sixty-one".