21423425166337 has 2 divisors, whose sum is σ = 21423425166338. Its totient is φ = 21423425166336.

The previous prime is 21423425166211. The next prime is 21423425166361. The reversal of 21423425166337 is 73366152432412.

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., 19921859218881 + 1501565947456 = 4463391^2 + 1225384^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423425166337 - 2¹⁵ = 21423425133569 is a prime.

It is a super-2 number, since 2×21423425166337² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21423425161337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711712583168 + 10711712583169.

It is an arithmetic number, because the mean of its divisors is an integer number (10711712583169).

Almost surely, 2^{21423425166337} is an apocalyptic number.

It is an amenable number.

21423425166337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423425166337 is an equidigital number, since it uses as much as digits as its factorization.

21423425166337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 49.

Adding to 21423425166337 its reverse (73366152432412), we get a palindrome (94789577598749).

The spelling of 21423425166337 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-five million, one hundred sixty-six thousand, three hundred thirty-seven".