221210201211121 has 4 divisors (see below), whose sum is σ = 221235233493492. Its totient is φ = 221185168928752.

The previous prime is 221210201211071. The next prime is 221210201211161. The reversal of 221210201211121 is 121112102012122.

It is a happy number.

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 219642359152896 + 1567842058225 = 14820336^2 + 1252135^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210201211121 - 2¹¹ = 221210201209073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210201211161) 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, 12516127930 + ... + 12516145603.

It is an arithmetic number, because the mean of its divisors is an integer number (55308808373373).

Almost surely, 2^{221210201211121} is an apocalyptic number.

It is an amenable number.

221210201211121 is a deficient number, since it is larger than the sum of its proper divisors (25032282371).

221210201211121 is an equidigital number, since it uses as much as digits as its factorization.

221210201211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25032282370.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221210201211121 its reverse (121112102012122), we get a palindrome (342322303223243).

The spelling of 221210201211121 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred one million, two hundred eleven thousand, one hundred twenty-one".