1255212221 has 16 divisors (see below), whose sum is σ = 1367352576. Its totient is φ = 1147700736.

The previous prime is 1255212199. The next prime is 1255212223. The reversal of 1255212221 is 1222125521.

It is not a de Polignac number, because 1255212221 - 2⁶ = 1255212157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255212223) 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, 103730 + ... + 115196.

It is an arithmetic number, because the mean of its divisors is an integer number (85459536).

Almost surely, 2^1255212221 is an apocalyptic number.

It is an amenable number.

1255212221 is a deficient number, since it is larger than the sum of its proper divisors (112140355).

1255212221 is a wasteful number, since it uses less digits than its factorization.

1255212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11668.

The product of its digits is 800, while the sum is 23.

The square root of 1255212221 is about 35428.9743148175. The cubic root of 1255212221 is about 1078.7125207192.

Adding to 1255212221 its reverse (1222125521), we get a palindrome (2477337742).

The spelling of 1255212221 in words is "one billion, two hundred fifty-five million, two hundred twelve thousand, two hundred twenty-one".