1031212332221 has 4 divisors (see below), whose sum is σ = 1050669168732. Its totient is φ = 1011755495712.

The previous prime is 1031212332211. The next prime is 1031212332251. The reversal of 1031212332221 is 1222332121301.

1031212332221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 689705335225 + 341506996996 = 830485^2 + 584386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031212332221 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 (1031212332211) 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, 9728418176 + ... + 9728418281.

It is an arithmetic number, because the mean of its divisors is an integer number (262667292183).

Almost surely, 2^{1031212332221} is an apocalyptic number.

It is an amenable number.

1031212332221 is a deficient number, since it is larger than the sum of its proper divisors (19456836511).

1031212332221 is an equidigital number, since it uses as much as digits as its factorization.

1031212332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19456836510.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1031212332221 its reverse (1222332121301), we get a palindrome (2253544453522).

It can be divided in two parts, 103121 and 2332221, that added together give a palindrome (2435342).

The spelling of 1031212332221 in words is "one trillion, thirty-one billion, two hundred twelve million, three hundred thirty-two thousand, two hundred twenty-one".