210020012021 has 2 divisors, whose sum is σ = 210020012022. Its totient is φ = 210020012020.

The previous prime is 210020012003. The next prime is 210020012047. The reversal of 210020012021 is 120210020012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149916096100 + 60103915921 = 387190^2 + 245161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210020012021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210020011993 and 210020012011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210020012051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010006010 + 105010006011.

It is an arithmetic number, because the mean of its divisors is an integer number (105010006011).

Almost surely, 2^210020012021 is an apocalyptic number.

It is an amenable number.

210020012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020012021 is an equidigital number, since it uses as much as digits as its factorization.

210020012021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 210020012021 its reverse (120210020012), we get a palindrome (330230032033).

The spelling of 210020012021 in words is "two hundred ten billion, twenty million, twelve thousand, twenty-one".