1321031222051 has 4 divisors (see below), whose sum is σ = 1321139970000. Its totient is φ = 1320922474104.

The previous prime is 1321031222029. The next prime is 1321031222053. The reversal of 1321031222051 is 1502221301231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321031222051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321031222053) 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, 54355751 + ... + 54380048.

It is an arithmetic number, because the mean of its divisors is an integer number (330284992500).

Almost surely, 2^{1321031222051} is an apocalyptic number.

1321031222051 is a deficient number, since it is larger than the sum of its proper divisors (108747949).

1321031222051 is a wasteful number, since it uses less digits than its factorization.

1321031222051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108747948.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 1321031222051 its reverse (1502221301231), we get a palindrome (2823252523282).

The spelling of 1321031222051 in words is "one trillion, three hundred twenty-one billion, thirty-one million, two hundred twenty-two thousand, fifty-one".