11111221001011 has 32 divisors (see below), whose sum is σ = 11733591323520. Its totient is φ = 10506372710400.

The previous prime is 11111221000969. The next prime is 11111221001021. The reversal of 11111221001011 is 11010012211111.

It is a cyclic number.

It is not a de Polignac number, because 11111221001011 - 2⁷ = 11111221000883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111221000982 and 11111221001000.

It is not an unprimeable number, because it can be changed into a prime (11111221001021) 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, 1033308211 + ... + 1033318963.

It is an arithmetic number, because the mean of its divisors is an integer number (366674728860).

Almost surely, 2^{11111221001011} is an apocalyptic number.

11111221001011 is a deficient number, since it is larger than the sum of its proper divisors (622370322509).

11111221001011 is a wasteful number, since it uses less digits than its factorization.

11111221001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13327.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11111221001011 its reverse (11010012211111), we get a palindrome (22121233212122).

The spelling of 11111221001011 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, one thousand, eleven".