212011220221061 has 2 divisors, whose sum is σ = 212011220221062. Its totient is φ = 212011220221060.

The previous prime is 212011220221057. The next prime is 212011220221079. The reversal of 212011220221061 is 160122022110212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211771443512161 + 239776708900 = 14552369^2 + 489670^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011220221061 - 2² = 212011220221057 is a prime.

It is a super-4 number, since 4×212011220221061⁴ (a number of 58 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011220226061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005610110530 + 106005610110531.

It is an arithmetic number, because the mean of its divisors is an integer number (106005610110531).

Almost surely, 2^{212011220221061} is an apocalyptic number.

It is an amenable number.

212011220221061 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011220221061 is an equidigital number, since it uses as much as digits as its factorization.

212011220221061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 212011220221061 its reverse (160122022110212), we get a palindrome (372133242331273).

The spelling of 212011220221061 in words is "two hundred twelve trillion, eleven billion, two hundred twenty million, two hundred twenty-one thousand, sixty-one".