212021120021 has 2 divisors, whose sum is σ = 212021120022. Its totient is φ = 212021120020.

The previous prime is 212021119997. The next prime is 212021120093. The reversal of 212021120021 is 120021120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193718818225 + 18302301796 = 440135^2 + 135286^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021120021 - 2⁶ = 212021119957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212021119978 and 212021120005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021120321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010560010 + 106010560011.

It is an arithmetic number, because the mean of its divisors is an integer number (106010560011).

Almost surely, 2^212021120021 is an apocalyptic number.

It is an amenable number.

212021120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021120021 is an equidigital number, since it uses as much as digits as its factorization.

212021120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212021120021 its reverse (120021120212), we get a palindrome (332042240233).

The spelling of 212021120021 in words is "two hundred twelve billion, twenty-one million, one hundred twenty thousand, twenty-one".