22020423504257 has 2 divisors, whose sum is σ = 22020423504258. Its totient is φ = 22020423504256.

The previous prime is 22020423504253. The next prime is 22020423504329. The reversal of 22020423504257 is 75240532402022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20163701140801 + 1856722363456 = 4490401^2 + 1362616^2 .

It is a cyclic number.

It is not a de Polignac number, because 22020423504257 - 2² = 22020423504253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22020423504257.

It is not a weakly prime, because it can be changed into another prime (22020423504253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010211752128 + 11010211752129.

It is an arithmetic number, because the mean of its divisors is an integer number (11010211752129).

Almost surely, 2^{22020423504257} is an apocalyptic number.

It is an amenable number.

22020423504257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22020423504257 is an equidigital number, since it uses as much as digits as its factorization.

22020423504257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268800, while the sum is 38.

Adding to 22020423504257 its reverse (75240532402022), we get a palindrome (97260955906279).

The spelling of 22020423504257 in words is "twenty-two trillion, twenty billion, four hundred twenty-three million, five hundred four thousand, two hundred fifty-seven".