2011221511 has 12 divisors (see below), whose sum is σ = 2179112760. Its totient is φ = 1855420320.

The previous prime is 2011221493. The next prime is 2011221523. The reversal of 2011221511 is 1151221102.

It is not a de Polignac number, because 2011221511 - 2⁹ = 2011220999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 489576 + ... + 493666.

It is an arithmetic number, because the mean of its divisors is an integer number (181592730).

Almost surely, 2^2011221511 is an apocalyptic number.

2011221511 is a deficient number, since it is larger than the sum of its proper divisors (167891249).

2011221511 is a wasteful number, since it uses less digits than its factorization.

2011221511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7026 (or 7013 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 2011221511 is about 44846.6443672211. The cubic root of 2011221511 is about 1262.2730262295.

Adding to 2011221511 its reverse (1151221102), we get a palindrome (3162442613).

The spelling of 2011221511 in words is "two billion, eleven million, two hundred twenty-one thousand, five hundred eleven".