1221430231 has 8 divisors (see below), whose sum is σ = 1404485504. Its totient is φ = 1040516280.

The previous prime is 1221430201. The next prime is 1221430289. The reversal of 1221430231 is 1320341221.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221430231 is a prime.

It is a super-2 number, since 2×1221430231² = 2983783618401426722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221430199 and 1221430208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221430201) 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 7 ways as a sum of consecutive naturals, for example, 534105 + ... + 536386.

It is an arithmetic number, because the mean of its divisors is an integer number (175560688).

Almost surely, 2^1221430231 is an apocalyptic number.

1221430231 is a deficient number, since it is larger than the sum of its proper divisors (183055273).

1221430231 is a wasteful number, since it uses less digits than its factorization.

1221430231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070661.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1221430231 is about 34948.9660934340. The cubic root of 1221430231 is about 1068.9471201860.

Adding to 1221430231 its reverse (1320341221), we get a palindrome (2541771452).

The spelling of 1221430231 in words is "one billion, two hundred twenty-one million, four hundred thirty thousand, two hundred thirty-one".