1255433221 has 16 divisors (see below), whose sum is σ = 1520467200. Its totient is φ = 1011928320.

The previous prime is 1255433191. The next prime is 1255433251. The reversal of 1255433221 is 1223345521.

It is an interprime number because it is at equal distance from previous prime (1255433191) and next prime (1255433251).

It is a cyclic number.

It is not a de Polignac number, because 1255433221 - 2⁹ = 1255432709 is a prime.

It is a super-2 number, since 2×1255433221² = 3152225144780869682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1255433221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255433251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162711 + ... + 170251.

It is an arithmetic number, because the mean of its divisors is an integer number (95029200).

Almost surely, 2^1255433221 is an apocalyptic number.

It is an amenable number.

1255433221 is a deficient number, since it is larger than the sum of its proper divisors (265033979).

1255433221 is a wasteful number, since it uses less digits than its factorization.

1255433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8964.

The product of its digits is 7200, while the sum is 28.

The square root of 1255433221 is about 35432.0930936912. The cubic root of 1255433221 is about 1078.7758251479.

Adding to 1255433221 its reverse (1223345521), we get a palindrome (2478778742).

The spelling of 1255433221 in words is "one billion, two hundred fifty-five million, four hundred thirty-three thousand, two hundred twenty-one".