1256222321 has 8 divisors (see below), whose sum is σ = 1260895488. Its totient is φ = 1251558000.

The previous prime is 1256222291. The next prime is 1256222351. The reversal of 1256222321 is 1232226521.

It is an interprime number because it is at equal distance from previous prime (1256222291) and next prime (1256222351).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256222321 - 2¹⁰ = 1256221297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256222351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415706 + ... + 418716.

It is an arithmetic number, because the mean of its divisors is an integer number (157611936).

Almost surely, 2^1256222321 is an apocalyptic number.

It is an amenable number.

1256222321 is a deficient number, since it is larger than the sum of its proper divisors (4673167).

1256222321 is an equidigital number, since it uses as much as digits as its factorization.

1256222321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423.

The product of its digits is 2880, while the sum is 26.

The square root of 1256222321 is about 35443.2267295177. The cubic root of 1256222321 is about 1079.0017985937.

Adding to 1256222321 its reverse (1232226521), we get a palindrome (2488448842).

The spelling of 1256222321 in words is "one billion, two hundred fifty-six million, two hundred twenty-two thousand, three hundred twenty-one".