1031330221021 has 8 divisors (see below), whose sum is σ = 1034413713144. Its totient is φ = 1028247644160.

The previous prime is 1031330220997. The next prime is 1031330221057. The reversal of 1031330221021 is 1201220331301.

It can be written as a sum of positive squares in 4 ways, for example, as 411315712921 + 620014508100 = 641339^2 + 787410^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1031330221021 - 2⁵ = 1031330220989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1031330221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031330224021) 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 7 ways as a sum of consecutive naturals, for example, 2062395 + ... + 2513191.

It is an arithmetic number, because the mean of its divisors is an integer number (129301714143).

Almost surely, 2^{1031330221021} is an apocalyptic number.

It is an amenable number.

1031330221021 is a deficient number, since it is larger than the sum of its proper divisors (3083492123).

1031330221021 is an equidigital number, since it uses as much as digits as its factorization.

1031330221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457631.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1031330221021 its reverse (1201220331301), we get a palindrome (2232550552322).

The spelling of 1031330221021 in words is "one trillion, thirty-one billion, three hundred thirty million, two hundred twenty-one thousand, twenty-one".