210210221121 has 4 divisors (see below), whose sum is σ = 280280294832. Its totient is φ = 140140147412.

The previous prime is 210210221087. The next prime is 210210221141. The reversal of 210210221121 is 121122012012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210210221121 - 2¹⁷ = 210210090049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210210221121.

It is not an unprimeable number, because it can be changed into a prime (210210221141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35035036851 + ... + 35035036856.

It is an arithmetic number, because the mean of its divisors is an integer number (70070073708).

Almost surely, 2^210210221121 is an apocalyptic number.

It is an amenable number.

210210221121 is a deficient number, since it is larger than the sum of its proper divisors (70070073711).

210210221121 is an equidigital number, since it uses as much as digits as its factorization.

210210221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70070073710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210210221121 its reverse (121122012012), we get a palindrome (331332233133).

The spelling of 210210221121 in words is "two hundred ten billion, two hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".