221231135353 has 2 divisors, whose sum is σ = 221231135354. Its totient is φ = 221231135352.

The previous prime is 221231135269. The next prime is 221231135387. The reversal of 221231135353 is 353531132122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198949005369 + 22282129984 = 446037^2 + 149272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221231135353 is a prime.

It is not a weakly prime, because it can be changed into another prime (221231135393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110615567676 + 110615567677.

It is an arithmetic number, because the mean of its divisors is an integer number (110615567677).

Almost surely, 2^221231135353 is an apocalyptic number.

It is an amenable number.

221231135353 is a deficient number, since it is larger than the sum of its proper divisors (1).

221231135353 is an equidigital number, since it uses as much as digits as its factorization.

221231135353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 31.

Adding to 221231135353 its reverse (353531132122), we get a palindrome (574762267475).

The spelling of 221231135353 in words is "two hundred twenty-one billion, two hundred thirty-one million, one hundred thirty-five thousand, three hundred fifty-three".