1221110011 has 32 divisors (see below), whose sum is σ = 1397200896. Its totient is φ = 1057536000.

The previous prime is 1221109973. The next prime is 1221110071. The reversal of 1221110011 is 1100111221.

It is a cyclic number.

It is not a de Polignac number, because 1221110011 - 2¹¹ = 1221107963 is a prime.

It is a super-2 number, since 2×1221110011² = 2982219317928840242, 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 1221110011.

It is not an unprimeable number, because it can be changed into a prime (1221110071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4505806 + ... + 4506076.

It is an arithmetic number, because the mean of its divisors is an integer number (43662528).

Almost surely, 2^1221110011 is an apocalyptic number.

1221110011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221110011 is a deficient number, since it is larger than the sum of its proper divisors (176090885).

1221110011 is a wasteful number, since it uses less digits than its factorization.

1221110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1221110011 is about 34944.3845417257. The cubic root of 1221110011 is about 1068.8536974220.

Adding to 1221110011 its reverse (1100111221), we get a palindrome (2321221232).

It can be divided in two parts, 12211 and 10011, that added together give a palindrome (22222).

The spelling of 1221110011 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, eleven".