1221222331 has 4 divisors (see below), whose sum is σ = 1395682672. Its totient is φ = 1046761992.

The previous prime is 1221222287. The next prime is 1221222341. The reversal of 1221222331 is 1332221221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221222331 - 2⁷ = 1221222203 is a prime.

It is a super-2 number, since 2×1221222331² = 2982767963466147122, 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 = 1221222299 and 1221222308.

It is not an unprimeable number, because it can be changed into a prime (1221222341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87230160 + ... + 87230173.

It is an arithmetic number, because the mean of its divisors is an integer number (348920668).

Almost surely, 2^1221222331 is an apocalyptic number.

1221222331 is a deficient number, since it is larger than the sum of its proper divisors (174460341).

1221222331 is an equidigital number, since it uses as much as digits as its factorization.

1221222331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174460340.

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

The square root of 1221222331 is about 34945.9916299423. The cubic root of 1221222331 is about 1068.8864681431.

Adding to 1221222331 its reverse (1332221221), we get a palindrome (2553443552).

It can be divided in two parts, 12212 and 22331, that added together give a palindrome (34543).

The spelling of 1221222331 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, three hundred thirty-one".