1221243231 has 8 divisors (see below), whose sum is σ = 1753580080. Its totient is φ = 751534272.

The previous prime is 1221243223. The next prime is 1221243269. The reversal of 1221243231 is 1323421221.

1221243231 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1221243231 - 2³ = 1221243223 is a prime.

It is a super-2 number, since 2×1221243231² = 2982870058526638722, 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 = 1221243198 and 1221243207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221243211) 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, 15656926 + ... + 15657003.

It is an arithmetic number, because the mean of its divisors is an integer number (219197510).

Almost surely, 2^1221243231 is an apocalyptic number.

1221243231 is a deficient number, since it is larger than the sum of its proper divisors (532336849).

1221243231 is a wasteful number, since it uses less digits than its factorization.

1221243231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31313945.

The product of its digits is 576, while the sum is 21.

The square root of 1221243231 is about 34946.2906615280. The cubic root of 1221243231 is about 1068.8925657496.

Adding to 1221243231 its reverse (1323421221), we get a palindrome (2544664452).

The spelling of 1221243231 in words is "one billion, two hundred twenty-one million, two hundred forty-three thousand, two hundred thirty-one".