1031220101221 has 4 divisors (see below), whose sum is σ = 1048125348844. Its totient is φ = 1014314853600.

The previous prime is 1031220101189. The next prime is 1031220101291. The reversal of 1031220101221 is 1221010221301.

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

It can be written as a sum of positive squares in 2 ways, for example, as 488441640996 + 542778460225 = 698886^2 + 736735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031220101221 - 2⁵ = 1031220101189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031220101195 and 1031220101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031220101291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8452623720 + ... + 8452623841.

It is an arithmetic number, because the mean of its divisors is an integer number (262031337211).

Almost surely, 2^{1031220101221} is an apocalyptic number.

It is an amenable number.

1031220101221 is a deficient number, since it is larger than the sum of its proper divisors (16905247623).

1031220101221 is an equidigital number, since it uses as much as digits as its factorization.

1031220101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16905247622.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1031220101221 its reverse (1221010221301), we get a palindrome (2252230322522).

The spelling of 1031220101221 in words is "one trillion, thirty-one billion, two hundred twenty million, one hundred one thousand, two hundred twenty-one".