20115350221 has 2 divisors, whose sum is σ = 20115350222. Its totient is φ = 20115350220.

The previous prime is 20115350207. The next prime is 20115350231. The reversal of 20115350221 is 12205351102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15721648996 + 4393701225 = 125386^2 + 66285^2 .

It is a cyclic number.

It is not a de Polignac number, because 20115350221 - 2¹⁹ = 20114825933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20115350192 and 20115350201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20115350231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10057675110 + 10057675111.

It is an arithmetic number, because the mean of its divisors is an integer number (10057675111).

Almost surely, 2^20115350221 is an apocalyptic number.

It is an amenable number.

20115350221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115350221 is an equidigital number, since it uses as much as digits as its factorization.

20115350221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

The spelling of 20115350221 in words is "twenty billion, one hundred fifteen million, three hundred fifty thousand, two hundred twenty-one".