211121012000221 has 4 divisors (see below), whose sum is σ = 211123611037692. Its totient is φ = 211118412962752.

The previous prime is 211121012000209. The next prime is 211121012000257. The reversal of 211121012000221 is 122000210121112.

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 150419554639225 + 60701457360996 = 12264565^2 + 7791114^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121012000221 - 2¹¹ = 211121011998173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121012000195 and 211121012000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121012009221) 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, 1299396886 + ... + 1299559351.

It is an arithmetic number, because the mean of its divisors is an integer number (52780902759423).

Almost surely, 2^{211121012000221} is an apocalyptic number.

It is an amenable number.

211121012000221 is a deficient number, since it is larger than the sum of its proper divisors (2599037471).

211121012000221 is an equidigital number, since it uses as much as digits as its factorization.

211121012000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599037470.

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

Adding to 211121012000221 its reverse (122000210121112), we get a palindrome (333121222121333).

The spelling of 211121012000221 in words is "two hundred eleven trillion, one hundred twenty-one billion, twelve million, two hundred twenty-one", and thus it is an aban number.