1225221321 has 8 divisors (see below), whose sum is σ = 1642093600. Its totient is φ = 812581632.

The previous prime is 1225221307. The next prime is 1225221323. The reversal of 1225221321 is 1231225221.

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

It is not a de Polignac number, because 1225221321 - 2⁹ = 1225220809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225221323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057471 + ... + 1058628.

It is an arithmetic number, because the mean of its divisors is an integer number (205261700).

Almost surely, 2^1225221321 is an apocalyptic number.

It is an amenable number.

1225221321 is a deficient number, since it is larger than the sum of its proper divisors (416872279).

1225221321 is a wasteful number, since it uses less digits than its factorization.

1225221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116295.

The product of its digits is 480, while the sum is 21.

The square root of 1225221321 is about 35003.1615857768. The cubic root of 1225221321 is about 1070.0519149703.

Adding to 1225221321 its reverse (1231225221), we get a palindrome (2456446542).

The spelling of 1225221321 in words is "one billion, two hundred twenty-five million, two hundred twenty-one thousand, three hundred twenty-one".