2011221015 has 16 divisors (see below), whose sum is σ = 3236558688. Its totient is φ = 1066449536.

The previous prime is 2011220999. The next prime is 2011221049. The reversal of 2011221015 is 5101221102.

It is a cyclic number.

It is not a de Polignac number, because 2011221015 - 2⁴ = 2011220999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 2011220985 and 2011221003.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 384924 + ... + 390113.

It is an arithmetic number, because the mean of its divisors is an integer number (202284918).

Almost surely, 2^2011221015 is an apocalyptic number.

2011221015 is a deficient number, since it is larger than the sum of its proper divisors (1225337673).

2011221015 is a wasteful number, since it uses less digits than its factorization.

2011221015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775218.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2011221015 is about 44846.6388372640. The cubic root of 2011221015 is about 1262.2729224638.

Adding to 2011221015 its reverse (5101221102), we get a palindrome (7112442117).

The spelling of 2011221015 in words is "two billion, eleven million, two hundred twenty-one thousand, fifteen".