21734315237 has 2 divisors, whose sum is σ = 21734315238. Its totient is φ = 21734315236.

The previous prime is 21734315203. The next prime is 21734315257. The reversal of 21734315237 is 73251343712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17990588641 + 3743726596 = 134129^2 + 61186^2 .

It is a cyclic number.

It is not a de Polignac number, because 21734315237 - 2⁶ = 21734315173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21734315237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21734315257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867157618 + 10867157619.

It is an arithmetic number, because the mean of its divisors is an integer number (10867157619).

Almost surely, 2^21734315237 is an apocalyptic number.

It is an amenable number.

21734315237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734315237 is an equidigital number, since it uses as much as digits as its factorization.

21734315237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 38.

Adding to 21734315237 its reverse (73251343712), we get a palindrome (94985658949).

The spelling of 21734315237 in words is "twenty-one billion, seven hundred thirty-four million, three hundred fifteen thousand, two hundred thirty-seven".