10002020021221 has 2 divisors, whose sum is σ = 10002020021222. Its totient is φ = 10002020021220.

The previous prime is 10002020021209. The next prime is 10002020021233. The reversal of 10002020021221 is 12212002020001.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (10002020021209) and next prime (10002020021233).

It can be written as a sum of positive squares in only one way, i.e., 6766917768900 + 3235102252321 = 2601330^2 + 1798639^2 .

It is a cyclic number.

It is not a de Polignac number, because 10002020021221 - 2¹⁹ = 10002019496933 is a prime.

It is a super-3 number, since 3×10002020021221³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10002020021251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001010010610 + 5001010010611.

It is an arithmetic number, because the mean of its divisors is an integer number (5001010010611).

Almost surely, 2^{10002020021221} is an apocalyptic number.

It is an amenable number.

10002020021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10002020021221 is an equidigital number, since it uses as much as digits as its factorization.

10002020021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 10002020021221 its reverse (12212002020001), we get a palindrome (22214022041222).

The spelling of 10002020021221 in words is "ten trillion, two billion, twenty million, twenty-one thousand, two hundred twenty-one".