211221211200001 has 4 divisors (see below), whose sum is σ = 212104981958400. Its totient is φ = 210337440441604.

The previous prime is 211221211199969. The next prime is 211221211200011. The reversal of 211221211200001 is 100002112122112.

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 211221211200001 - 2⁵ = 211221211199969 is a prime.

It is a super-2 number, since 2×211221211200001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221211200011) 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 3 ways as a sum of consecutive naturals, for example, 441885378841 + ... + 441885379318.

It is an arithmetic number, because the mean of its divisors is an integer number (53026245489600).

Almost surely, 2^{211221211200001} is an apocalyptic number.

It is an amenable number.

211221211200001 is a deficient number, since it is larger than the sum of its proper divisors (883770758399).

211221211200001 is an equidigital number, since it uses as much as digits as its factorization.

211221211200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883770758398.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211221211200001 its reverse (100002112122112), we get a palindrome (311223323322113).

The spelling of 211221211200001 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred thousand, one".