221020021169 has 2 divisors, whose sum is σ = 221020021170. Its totient is φ = 221020021168.

The previous prime is 221020021147. The next prime is 221020021241. The reversal of 221020021169 is 961120020122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203299086769 + 17720934400 = 450887^2 + 133120^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020021169 - 2¹² = 221020017073 is a prime.

It is a super-2 number, since 2×221020021169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221020021139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510010584 + 110510010585.

It is an arithmetic number, because the mean of its divisors is an integer number (110510010585).

Almost surely, 2^221020021169 is an apocalyptic number.

It is an amenable number.

221020021169 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020021169 is an equidigital number, since it uses as much as digits as its factorization.

221020021169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 221020021169 in words is "two hundred twenty-one billion, twenty million, twenty-one thousand, one hundred sixty-nine".