1010020020221 has 2 divisors, whose sum is σ = 1010020020222. Its totient is φ = 1010020020220.

The previous prime is 1010020020181. The next prime is 1010020020277. The reversal of 1010020020221 is 1220200200101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 703729720996 + 306290299225 = 838886^2 + 553435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010020020221 - 2⁶ = 1010020020157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010020020521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505010010110 + 505010010111.

It is an arithmetic number, because the mean of its divisors is an integer number (505010010111).

Almost surely, 2^{1010020020221} is an apocalyptic number.

It is an amenable number.

1010020020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010020020221 is an equidigital number, since it uses as much as digits as its factorization.

1010020020221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1010020020221 its reverse (1220200200101), we get a palindrome (2230220220322).

The spelling of 1010020020221 in words is "one trillion, ten billion, twenty million, twenty thousand, two hundred twenty-one".