210220202121 has 16 divisors (see below), whose sum is σ = 283145021760. Its totient is φ = 138728168640.

The previous prime is 210220202111. The next prime is 210220202141. The reversal of 210220202121 is 121202022012.

It is not a de Polignac number, because 210220202121 - 2¹⁴ = 210220185737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210220202121.

It is not an unprimeable number, because it can be changed into a prime (210220202111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 765535 + ... + 1003236.

It is an arithmetic number, because the mean of its divisors is an integer number (17696563860).

Almost surely, 2^210220202121 is an apocalyptic number.

It is an amenable number.

210220202121 is a deficient number, since it is larger than the sum of its proper divisors (72924819639).

210220202121 is a wasteful number, since it uses less digits than its factorization.

210220202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769176.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 210220202121 its reverse (121202022012), we get a palindrome (331422224133).

The spelling of 210220202121 in words is "two hundred ten billion, two hundred twenty million, two hundred two thousand, one hundred twenty-one".