1221333043 has 16 divisors (see below), whose sum is σ = 1409101056. Its totient is φ = 1036919520.

The previous prime is 1221333019. The next prime is 1221333059. The reversal of 1221333043 is 3403331221.

It is not a de Polignac number, because 1221333043 - 2⁵ = 1221333011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221333073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707980 + ... + 709702.

It is an arithmetic number, because the mean of its divisors is an integer number (88068816).

Almost surely, 2^1221333043 is an apocalyptic number.

1221333043 is a deficient number, since it is larger than the sum of its proper divisors (187768013).

1221333043 is a wasteful number, since it uses less digits than its factorization.

1221333043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 1221333043 is about 34947.5756383758. The cubic root of 1221333043 is about 1068.9187677443.

Adding to 1221333043 its reverse (3403331221), we get a palindrome (4624664264).

The spelling of 1221333043 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, forty-three".