204402111281 has 2 divisors, whose sum is σ = 204402111282. Its totient is φ = 204402111280.

The previous prime is 204402111223. The next prime is 204402111299. The reversal of 204402111281 is 182111204402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155302199056 + 49099912225 = 394084^2 + 221585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204402111281 is a prime.

It is a super-2 number, since 2×204402111281² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204402111281.

It is not a weakly prime, because it can be changed into another prime (204402113281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102201055640 + 102201055641.

It is an arithmetic number, because the mean of its divisors is an integer number (102201055641).

Almost surely, 2^204402111281 is an apocalyptic number.

It is an amenable number.

204402111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

204402111281 is an equidigital number, since it uses as much as digits as its factorization.

204402111281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 26.

Adding to 204402111281 its reverse (182111204402), we get a palindrome (386513315683).

The spelling of 204402111281 in words is "two hundred four billion, four hundred two million, one hundred eleven thousand, two hundred eighty-one".