212110220081 has 2 divisors, whose sum is σ = 212110220082. Its totient is φ = 212110220080.

The previous prime is 212110220071. The next prime is 212110220111. The reversal of 212110220081 is 180022011212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154009938481 + 58100281600 = 392441^2 + 241040^2 .

It is a cyclic number.

It is not a de Polignac number, because 212110220081 - 2²² = 212106025777 is a prime.

It is a super-2 number, since 2×212110220081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212110220071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106055110040 + 106055110041.

It is an arithmetic number, because the mean of its divisors is an integer number (106055110041).

Almost surely, 2^212110220081 is an apocalyptic number.

It is an amenable number.

212110220081 is a deficient number, since it is larger than the sum of its proper divisors (1).

212110220081 is an equidigital number, since it uses as much as digits as its factorization.

212110220081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212110220081 its reverse (180022011212), we get a palindrome (392132231293).

The spelling of 212110220081 in words is "two hundred twelve billion, one hundred ten million, two hundred twenty thousand, eighty-one".