210000122021 has 4 divisors (see below), whose sum is σ = 210388292844. Its totient is φ = 209611951200.

The previous prime is 210000121957. The next prime is 210000122027. The reversal of 210000122021 is 120221000012.

It is a happy number.

210000122021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35263581796 + 174736540225 = 187786^2 + 418015^2 .

It is a cyclic number.

It is not a de Polignac number, because 210000122021 - 2⁶ = 210000121957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210000121993 and 210000122011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000122027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194084600 + ... + 194085681.

It is an arithmetic number, because the mean of its divisors is an integer number (52597073211).

Almost surely, 2^210000122021 is an apocalyptic number.

It is an amenable number.

210000122021 is a deficient number, since it is larger than the sum of its proper divisors (388170823).

210000122021 is an equidigital number, since it uses as much as digits as its factorization.

210000122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388170822.

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

Adding to 210000122021 its reverse (120221000012), we get a palindrome (330221122033).

The spelling of 210000122021 in words is "two hundred ten billion, one hundred twenty-two thousand, twenty-one".