212112001021 has 2 divisors, whose sum is σ = 212112001022. Its totient is φ = 212112001020.

The previous prime is 212112000973. The next prime is 212112001033. The reversal of 212112001021 is 120100211212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195156315225 + 16955685796 = 441765^2 + 130214^2 .

It is a cyclic number.

It is not a de Polignac number, because 212112001021 - 2⁹ = 212112000509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212112000992 and 212112001010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212112002021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106056000510 + 106056000511.

It is an arithmetic number, because the mean of its divisors is an integer number (106056000511).

Almost surely, 2^212112001021 is an apocalyptic number.

It is an amenable number.

212112001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212112001021 is an equidigital number, since it uses as much as digits as its factorization.

212112001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212112001021 its reverse (120100211212), we get a palindrome (332212212233).

The spelling of 212112001021 in words is "two hundred twelve billion, one hundred twelve million, one thousand, twenty-one".