1020200221 has 2 divisors, whose sum is σ = 1020200222. Its totient is φ = 1020200220.

The previous prime is 1020200219. The next prime is 1020200239. The reversal of 1020200221 is 1220020201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 875864025 + 144336196 = 29595^2 + 12014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020200221 - 2¹ = 1020200219 is a prime.

Together with 1020200219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1020200198 and 1020200207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020200201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510100110 + 510100111.

It is an arithmetic number, because the mean of its divisors is an integer number (510100111).

Almost surely, 2^1020200221 is an apocalyptic number.

It is an amenable number.

1020200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020200221 is an equidigital number, since it uses as much as digits as its factorization.

1020200221 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 10.

The square root of 1020200221 is about 31940.5732728766. The cubic root of 1020200221 is about 1006.6885702854.

Adding to 1020200221 its reverse (1220020201), we get a palindrome (2240220422).

The spelling of 1020200221 in words is "one billion, twenty million, two hundred thousand, two hundred twenty-one".