220211100001021 has 2 divisors, whose sum is σ = 220211100001022. Its totient is φ = 220211100001020.

The previous prime is 220211100001007. The next prime is 220211100001049. The reversal of 220211100001021 is 120100001112022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159852402725625 + 60358697275396 = 12643275^2 + 7769086^2 .

It is a cyclic number.

It is not a de Polignac number, because 220211100001021 - 2¹⁵ = 220211099968253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220211100000992 and 220211100001010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220211100002021) 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, 110105550000510 + 110105550000511.

It is an arithmetic number, because the mean of its divisors is an integer number (110105550000511).

Almost surely, 2^{220211100001021} is an apocalyptic number.

It is an amenable number.

220211100001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220211100001021 is an equidigital number, since it uses as much as digits as its factorization.

220211100001021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 220211100001021 its reverse (120100001112022), we get a palindrome (340311101113043).

The spelling of 220211100001021 in words is "two hundred twenty trillion, two hundred eleven billion, one hundred million, one thousand, twenty-one".