1031120221 has 4 divisors (see below), whose sum is σ = 1031189500. Its totient is φ = 1031050944.

The previous prime is 1031120219. The next prime is 1031120231. The reversal of 1031120221 is 1220211301.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 375196900 + 655923321 = 19370^2 + 25611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031120221 - 2¹ = 1031120219 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 (1031120231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2166 + ... + 45463.

It is an arithmetic number, because the mean of its divisors is an integer number (257797375).

Almost surely, 2^1031120221 is an apocalyptic number.

It is an amenable number.

1031120221 is a deficient number, since it is larger than the sum of its proper divisors (69279).

1031120221 is an equidigital number, since it uses as much as digits as its factorization.

1031120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69278.

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

The square root of 1031120221 is about 32111.0607267963. The cubic root of 1031120221 is about 1010.2676221179.

Adding to 1031120221 its reverse (1220211301), we get a palindrome (2251331522).

The spelling of 1031120221 in words is "one billion, thirty-one million, one hundred twenty thousand, two hundred twenty-one".