210211222121 has 8 divisors (see below), whose sum is σ = 210978549288. Its totient is φ = 209444032000.

The previous prime is 210211222103. The next prime is 210211222183. The reversal of 210211222121 is 121222112012.

It can be written as a sum of positive squares in 4 ways, for example, as 15786666025 + 194424556096 = 125645^2 + 440936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210211222121 - 2¹⁰ = 210211221097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210211222121.

It is not an unprimeable number, because it can be changed into a prime (210211212121) 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 7 ways as a sum of consecutive naturals, for example, 3828341 + ... + 3882861.

It is an arithmetic number, because the mean of its divisors is an integer number (26372318661).

Almost surely, 2^210211222121 is an apocalyptic number.

It is an amenable number.

210211222121 is a deficient number, since it is larger than the sum of its proper divisors (767327167).

210211222121 is a wasteful number, since it uses less digits than its factorization.

210211222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68523.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210211222121 its reverse (121222112012), we get a palindrome (331433334133).

The spelling of 210211222121 in words is "two hundred ten billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".