2121101120221 has 2 divisors, whose sum is σ = 2121101120222. Its totient is φ = 2121101120220.

The previous prime is 2121101120191. The next prime is 2121101120233. The reversal of 2121101120221 is 1220211011212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1768870740121 + 352230380100 = 1329989^2 + 593490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121101120221 - 2¹³ = 2121101112029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121101120195 and 2121101120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121101120321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060550560110 + 1060550560111.

It is an arithmetic number, because the mean of its divisors is an integer number (1060550560111).

Almost surely, 2^{2121101120221} is an apocalyptic number.

It is an amenable number.

2121101120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121101120221 is an equidigital number, since it uses as much as digits as its factorization.

2121101120221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2121101120221 its reverse (1220211011212), we get a palindrome (3341312131433).

It can be divided in two parts, 212110 and 1120221, that added together give a palindrome (1332331).

The spelling of 2121101120221 in words is "two trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty thousand, two hundred twenty-one".