221210211073 has 2 divisors, whose sum is σ = 221210211074. Its totient is φ = 221210211072.

The previous prime is 221210211067. The next prime is 221210211113. The reversal of 221210211073 is 370112012122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186989650929 + 34220560144 = 432423^2 + 184988^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210211073 - 2¹⁷ = 221210080001 is a prime.

It is a super-2 number, since 2×221210211073² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221210211023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605105536 + 110605105537.

It is an arithmetic number, because the mean of its divisors is an integer number (110605105537).

Almost surely, 2^221210211073 is an apocalyptic number.

It is an amenable number.

221210211073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210211073 is an equidigital number, since it uses as much as digits as its factorization.

221210211073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 221210211073 its reverse (370112012122), we get a palindrome (591322223195).

The spelling of 221210211073 in words is "two hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, seventy-three".