1235255221 has 4 divisors (see below), whose sum is σ = 1235566444. Its totient is φ = 1234944000.

The previous prime is 1235255209. The next prime is 1235255243. The reversal of 1235255221 is 1225525321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1225525321 = 251 ⋅4882571.

It can be written as a sum of positive squares in 2 ways, for example, as 635544100 + 599711121 = 25210^2 + 24489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1235255221 is a prime.

It is a super-2 number, since 2×1235255221² = 3051710922015517682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1235255221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235255251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149580 + ... + 157621.

It is an arithmetic number, because the mean of its divisors is an integer number (308891611).

Almost surely, 2^1235255221 is an apocalyptic number.

It is an amenable number.

1235255221 is a deficient number, since it is larger than the sum of its proper divisors (311223).

1235255221 is an equidigital number, since it uses as much as digits as its factorization.

1235255221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311222.

The product of its digits is 6000, while the sum is 28.

The square root of 1235255221 is about 35146.1978171181. The cubic root of 1235255221 is about 1072.9650259432.

The spelling of 1235255221 in words is "one billion, two hundred thirty-five million, two hundred fifty-five thousand, two hundred twenty-one".