2031221031 has 16 divisors (see below), whose sum is σ = 3127106304. Its totient is φ = 1148730624.

The previous prime is 2031221009. The next prime is 2031221041. The reversal of 2031221031 is 1301221302.

It is not a de Polignac number, because 2031221031 - 2⁹ = 2031220519 is a prime.

It is a super-2 number, since 2×2031221031² = 8251717753553405922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2031221031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031221041) 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 15 ways as a sum of consecutive naturals, for example, 496545 + ... + 500618.

It is an arithmetic number, because the mean of its divisors is an integer number (195444144).

Almost surely, 2^2031221031 is an apocalyptic number.

2031221031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2031221031 is a deficient number, since it is larger than the sum of its proper divisors (1095885273).

2031221031 is an equidigital number, since it uses as much as digits as its factorization.

2031221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997270.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2031221031 is about 45069.0695599543. The cubic root of 2031221031 is about 1266.4432341897.

Adding to 2031221031 its reverse (1301221302), we get a palindrome (3332442333).

The spelling of 2031221031 in words is "two billion, thirty-one million, two hundred twenty-one thousand, thirty-one".