255535222121 has 2 divisors, whose sum is σ = 255535222122. Its totient is φ = 255535222120.

The previous prime is 255535222097. The next prime is 255535222139. The reversal of 255535222121 is 121222535552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176568040000 + 78967182121 = 420200^2 + 281011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255535222121 is a prime.

It is not a weakly prime, because it can be changed into another prime (255535222021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127767611060 + 127767611061.

It is an arithmetic number, because the mean of its divisors is an integer number (127767611061).

Almost surely, 2^255535222121 is an apocalyptic number.

It is an amenable number.

255535222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

255535222121 is an equidigital number, since it uses as much as digits as its factorization.

255535222121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60000, while the sum is 35.

Adding to 255535222121 its reverse (121222535552), we get a palindrome (376757757673).

The spelling of 255535222121 in words is "two hundred fifty-five billion, five hundred thirty-five million, two hundred twenty-two thousand, one hundred twenty-one".