21030111321001 has 2 divisors, whose sum is σ = 21030111321002. Its totient is φ = 21030111321000.

The previous prime is 21030111320983. The next prime is 21030111321053. The reversal of 21030111321001 is 10012311103012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20954787969600 + 75323351401 = 4577640^2 + 274451^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030111321001 - 2¹⁷ = 21030111189929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21030111322001) 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 as a sum of consecutive naturals, namely, 10515055660500 + 10515055660501.

It is an arithmetic number, because the mean of its divisors is an integer number (10515055660501).

Almost surely, 2^{21030111321001} is an apocalyptic number.

It is an amenable number.

21030111321001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030111321001 is an equidigital number, since it uses as much as digits as its factorization.

21030111321001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21030111321001 its reverse (10012311103012), we get a palindrome (31042422424013).

The spelling of 21030111321001 in words is "twenty-one trillion, thirty billion, one hundred eleven million, three hundred twenty-one thousand, one".