212011001222021 has 2 divisors, whose sum is σ = 212011001222022. Its totient is φ = 212011001222020.

The previous prime is 212011001222003. The next prime is 212011001222023. The reversal of 212011001222021 is 120222100110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144315772922500 + 67695228299521 = 12013150^2 + 8227711^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011001222021 - 2¹⁴ = 212011001205637 is a prime.

It is a Sophie Germain prime.

Together with 212011001222023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011001222023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005500611010 + 106005500611011.

It is an arithmetic number, because the mean of its divisors is an integer number (106005500611011).

Almost surely, 2^{212011001222021} is an apocalyptic number.

It is an amenable number.

212011001222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011001222021 is an equidigital number, since it uses as much as digits as its factorization.

212011001222021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212011001222021 its reverse (120222100110212), we get a palindrome (332233101332233).

The spelling of 212011001222021 in words is "two hundred twelve trillion, eleven billion, one million, two hundred twenty-two thousand, twenty-one".