212210221021 has 2 divisors, whose sum is σ = 212210221022. Its totient is φ = 212210221020.

The previous prime is 212210220961. The next prime is 212210221061. The reversal of 212210221021 is 120122012212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212208556921 + 1664100 = 460661^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 212210221021 - 2¹³ = 212210212829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212210220986 and 212210221004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212210221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106105110510 + 106105110511.

It is an arithmetic number, because the mean of its divisors is an integer number (106105110511).

Almost surely, 2^212210221021 is an apocalyptic number.

It is an amenable number.

212210221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212210221021 is an equidigital number, since it uses as much as digits as its factorization.

212210221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212210221021 its reverse (120122012212), we get a palindrome (332332233233).

The spelling of 212210221021 in words is "two hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, twenty-one".