1321002332021 has 2 divisors, whose sum is σ = 1321002332022. Its totient is φ = 1321002332020.

The previous prime is 1321002332011. The next prime is 1321002332057. The reversal of 1321002332021 is 1202332001231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941121172996 + 379881159025 = 970114^2 + 616345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321002332021 - 2¹⁴ = 1321002315637 is a prime.

It is a super-2 number, since 2×1321002332021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321002331984 and 1321002332002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321002332011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660501166010 + 660501166011.

It is an arithmetic number, because the mean of its divisors is an integer number (660501166011).

Almost surely, 2^{1321002332021} is an apocalyptic number.

It is an amenable number.

1321002332021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321002332021 is an equidigital number, since it uses as much as digits as its factorization.

1321002332021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1321002332021 its reverse (1202332001231), we get a palindrome (2523334333252).

The spelling of 1321002332021 in words is "one trillion, three hundred twenty-one billion, two million, three hundred thirty-two thousand, twenty-one".