21054340337 has 2 divisors, whose sum is σ = 21054340338. Its totient is φ = 21054340336.

The previous prime is 21054340331. The next prime is 21054340357. The reversal of 21054340337 is 73304345012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17170433296 + 3883907041 = 131036^2 + 62321^2 .

It is a cyclic number.

It is not a de Polignac number, because 21054340337 - 2⁶ = 21054340273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21054340331) 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 as a sum of consecutive naturals, namely, 10527170168 + 10527170169.

It is an arithmetic number, because the mean of its divisors is an integer number (10527170169).

Almost surely, 2^21054340337 is an apocalyptic number.

It is an amenable number.

21054340337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054340337 is an equidigital number, since it uses as much as digits as its factorization.

21054340337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 32.

Adding to 21054340337 its reverse (73304345012), we get a palindrome (94358685349).

The spelling of 21054340337 in words is "twenty-one billion, fifty-four million, three hundred forty thousand, three hundred thirty-seven".