21523340150237 has 2 divisors, whose sum is σ = 21523340150238. Its totient is φ = 21523340150236.

The previous prime is 21523340150201. The next prime is 21523340150281. The reversal of 21523340150237 is 73205104332512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17364130686841 + 4159209463396 = 4167029^2 + 2039414^2 .

It is a cyclic number.

It is not a de Polignac number, because 21523340150237 - 2¹² = 21523340146141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21523340150237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21523340150437) 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, 10761670075118 + 10761670075119.

It is an arithmetic number, because the mean of its divisors is an integer number (10761670075119).

Almost surely, 2^{21523340150237} is an apocalyptic number.

It is an amenable number.

21523340150237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21523340150237 is an equidigital number, since it uses as much as digits as its factorization.

21523340150237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 38.

Adding to 21523340150237 its reverse (73205104332512), we get a palindrome (94728444482749).

The spelling of 21523340150237 in words is "twenty-one trillion, five hundred twenty-three billion, three hundred forty million, one hundred fifty thousand, two hundred thirty-seven".