2011221031 has 4 divisors (see below), whose sum is σ = 2011503952. Its totient is φ = 2010938112.

The previous prime is 2011220999. The next prime is 2011221049. The reversal of 2011221031 is 1301221102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2011221031 - 2⁵ = 2011220999 is a prime.

It is a super-2 number, since 2×2011221031² = 8090020071073405922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221061) 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 3 ways as a sum of consecutive naturals, for example, 130515 + ... + 145108.

It is an arithmetic number, because the mean of its divisors is an integer number (502875988).

Almost surely, 2^2011221031 is an apocalyptic number.

2011221031 is a deficient number, since it is larger than the sum of its proper divisors (282921).

2011221031 is an equidigital number, since it uses as much as digits as its factorization.

2011221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282920.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2011221031 is about 44846.6390156498. The cubic root of 2011221031 is about 1262.2729258110.

Adding to 2011221031 its reverse (1301221102), we get a palindrome (3312442133).

The spelling of 2011221031 in words is "two billion, eleven million, two hundred twenty-one thousand, thirty-one".