221021020361 has 2 divisors, whose sum is σ = 221021020362. Its totient is φ = 221021020360.

The previous prime is 221021020349. The next prime is 221021020369. The reversal of 221021020361 is 163020120122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214883238025 + 6137782336 = 463555^2 + 78344^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021020361 - 2²² = 221016826057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221021020369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510510180 + 110510510181.

It is an arithmetic number, because the mean of its divisors is an integer number (110510510181).

Almost surely, 2^221021020361 is an apocalyptic number.

It is an amenable number.

221021020361 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021020361 is an equidigital number, since it uses as much as digits as its factorization.

221021020361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221021020361 its reverse (163020120122), we get a palindrome (384041140483).

The spelling of 221021020361 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, three hundred sixty-one".