21003030022021 has 2 divisors, whose sum is σ = 21003030022022. Its totient is φ = 21003030022020.

The previous prime is 21003030021947. The next prime is 21003030022033. The reversal of 21003030022021 is 12022003030012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14327209116900 + 6675820905121 = 3785130^2 + 2583761^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003030022021 - 2²⁹ = 21002493151109 is a prime.

It is a super-3 number, since 3×21003030022021³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21003030021986 and 21003030022004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003030022061) 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, 10501515011010 + 10501515011011.

It is an arithmetic number, because the mean of its divisors is an integer number (10501515011011).

Almost surely, 2^{21003030022021} is an apocalyptic number.

It is an amenable number.

21003030022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003030022021 is an equidigital number, since it uses as much as digits as its factorization.

21003030022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21003030022021 its reverse (12022003030012), we get a palindrome (33025033052033).

The spelling of 21003030022021 in words is "twenty-one trillion, three billion, thirty million, twenty-two thousand, twenty-one".