1221123043 has 8 divisors (see below), whose sum is σ = 1402184960. Its totient is φ = 1041715080.

The previous prime is 1221123041. The next prime is 1221123047. The reversal of 1221123043 is 3403211221.

It is a happy number.

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

It is not a de Polignac number, because 1221123043 - 2¹ = 1221123041 is a prime.

It is a super-2 number, since 2×1221123043² = 2982282972291159698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221123043.

It is not an unprimeable number, because it can be changed into a prime (1221123041) 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, 411903 + ... + 414856.

It is an arithmetic number, because the mean of its divisors is an integer number (175273120).

Almost surely, 2^1221123043 is an apocalyptic number.

1221123043 is a deficient number, since it is larger than the sum of its proper divisors (181061917).

1221123043 is an equidigital number, since it uses as much as digits as its factorization.

1221123043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826977.

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

The square root of 1221123043 is about 34944.5710089565. The cubic root of 1221123043 is about 1068.8574997690.

Adding to 1221123043 its reverse (3403211221), we get a palindrome (4624334264).

The spelling of 1221123043 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, forty-three".