1221233331 has 8 divisors (see below), whose sum is σ = 1631875984. Its totient is φ = 812373120.

The previous prime is 1221233329. The next prime is 1221233333. The reversal of 1221233331 is 1333321221.

It is an interprime number because it is at equal distance from previous prime (1221233329) and next prime (1221233333).

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

It is not a de Polignac number, because 1221233331 - 2¹ = 1221233329 is a prime.

It is a super-2 number, since 2×1221233331² = 2982821697490711122, 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 = 1221233298 and 1221233307.

It is not an unprimeable number, because it can be changed into a prime (1221233333) 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, 444010 + ... + 446751.

It is an arithmetic number, because the mean of its divisors is an integer number (203984498).

Almost surely, 2^1221233331 is an apocalyptic number.

1221233331 is a deficient number, since it is larger than the sum of its proper divisors (410642653).

1221233331 is an equidigital number, since it uses as much as digits as its factorization.

1221233331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891221.

The product of its digits is 648, while the sum is 21.

The square root of 1221233331 is about 34946.1490153064. The cubic root of 1221233331 is about 1068.8896774183.

Adding to 1221233331 its reverse (1333321221), we get a palindrome (2554554552).

The spelling of 1221233331 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, three hundred thirty-one".