212002001021 has 2 divisors, whose sum is σ = 212002001022. Its totient is φ = 212002001020.

The previous prime is 212002000993. The next prime is 212002001023. The reversal of 212002001021 is 120100200212.

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., 202692645796 + 9309355225 = 450214^2 + 96485^2 .

It is a cyclic number.

It is not a de Polignac number, because 212002001021 - 2¹⁴ = 212001984637 is a prime.

Together with 212002001023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212002000993 and 212002001011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212002001023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106001000510 + 106001000511.

It is an arithmetic number, because the mean of its divisors is an integer number (106001000511).

Almost surely, 2^212002001021 is an apocalyptic number.

It is an amenable number.

212002001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212002001021 is an equidigital number, since it uses as much as digits as its factorization.

212002001021 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 11.

Adding to 212002001021 its reverse (120100200212), we get a palindrome (332102201233).

The spelling of 212002001021 in words is "two hundred twelve billion, two million, one thousand, twenty-one".