2031221121 has 8 divisors (see below), whose sum is σ = 2711458464. Its totient is φ = 1352565600.

The previous prime is 2031221117. The next prime is 2031221141. The reversal of 2031221121 is 1211221302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2031221121 - 2² = 2031221117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2031221121.

It is not an unprimeable number, because it can be changed into a prime (2031221141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392455 + ... + 397596.

It is an arithmetic number, because the mean of its divisors is an integer number (338932308).

Almost surely, 2^2031221121 is an apocalyptic number.

It is an amenable number.

2031221121 is a deficient number, since it is larger than the sum of its proper divisors (680237343).

2031221121 is an equidigital number, since it uses as much as digits as its factorization.

2031221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790911.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2031221121 is about 45069.0705584218. The cubic root of 2031221121 is about 1266.4432528944.

Adding to 2031221121 its reverse (1211221302), we get a palindrome (3242442423).

The spelling of 2031221121 in words is "two billion, thirty-one million, two hundred twenty-one thousand, one hundred twenty-one".