1031010123221 has 4 divisors (see below), whose sum is σ = 1110318594252. Its totient is φ = 951701652192.

The previous prime is 1031010123217. The next prime is 1031010123251. The reversal of 1031010123221 is 1223210101301.

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 52521180625 + 978488942596 = 229175^2 + 989186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031010123221 - 2² = 1031010123217 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 1031010123221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031010123251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39654235496 + ... + 39654235521.

It is an arithmetic number, because the mean of its divisors is an integer number (277579648563).

Almost surely, 2^{1031010123221} is an apocalyptic number.

It is an amenable number.

1031010123221 is a deficient number, since it is larger than the sum of its proper divisors (79308471031).

1031010123221 is an equidigital number, since it uses as much as digits as its factorization.

1031010123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79308471030.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1031010123221 its reverse (1223210101301), we get a palindrome (2254220224522).

The spelling of 1031010123221 in words is "one trillion, thirty-one billion, ten million, one hundred twenty-three thousand, two hundred twenty-one".