210212121101 has 4 divisors (see below), whose sum is σ = 210220177692. Its totient is φ = 210204064512.

The previous prime is 210212121089. The next prime is 210212121107. The reversal of 210212121101 is 101121212012.

210212121101 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 131660848201 + 78551272900 = 362851^2 + 280270^2 .

It is a cyclic number.

It is not a de Polignac number, because 210212121101 - 2¹⁰ = 210212120077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210212121107) 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, 3989030 + ... + 4041383.

It is an arithmetic number, because the mean of its divisors is an integer number (52555044423).

Almost surely, 2^210212121101 is an apocalyptic number.

It is an amenable number.

210212121101 is a deficient number, since it is larger than the sum of its proper divisors (8056591).

210212121101 is an equidigital number, since it uses as much as digits as its factorization.

210212121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8056590.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210212121101 its reverse (101121212012), we get a palindrome (311333333113).

The spelling of 210212121101 in words is "two hundred ten billion, two hundred twelve million, one hundred twenty-one thousand, one hundred one".