2101340221 has 2 divisors, whose sum is σ = 2101340222. Its totient is φ = 2101340220.

The previous prime is 2101340201. The next prime is 2101340291. The reversal of 2101340221 is 1220431012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2050731225 + 50608996 = 45285^2 + 7114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101340221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101340195 and 2101340204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101340201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050670110 + 1050670111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050670111).

Almost surely, 2^2101340221 is an apocalyptic number.

It is an amenable number.

2101340221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101340221 is an equidigital number, since it uses as much as digits as its factorization.

2101340221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2101340221 is about 45840.3776271531. The cubic root of 2101340221 is about 1280.8515291324.

Adding to 2101340221 its reverse (1220431012), we get a palindrome (3321771233).

It can be divided in two parts, 210 and 1340221, that added together give a palindrome (1340431).

The spelling of 2101340221 in words is "two billion, one hundred one million, three hundred forty thousand, two hundred twenty-one".