1221103011 has 8 divisors (see below), whose sum is σ = 1628379904. Its totient is φ = 813947400.

The previous prime is 1221103003. The next prime is 1221103031. The reversal of 1221103011 is 1103011221.

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

It is not a de Polignac number, because 1221103011 - 2³ = 1221103003 is a prime.

It is a super-2 number, since 2×1221103011² = 2982185126946532242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221103031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3415 + ... + 49536.

It is an arithmetic number, because the mean of its divisors is an integer number (203547488).

Almost surely, 2^1221103011 is an apocalyptic number.

1221103011 is a deficient number, since it is larger than the sum of its proper divisors (407276893).

1221103011 is an equidigital number, since it uses as much as digits as its factorization.

1221103011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60641.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1221103011 is about 34944.2843824280. The cubic root of 1221103011 is about 1068.8516550207.

Adding to 1221103011 its reverse (1103011221), we get a palindrome (2324114232).

The spelling of 1221103011 in words is "one billion, two hundred twenty-one million, one hundred three thousand, eleven".