1011020221 has 2 divisors, whose sum is σ = 1011020222. Its totient is φ = 1011020220.

The previous prime is 1011020173. The next prime is 1011020249. The reversal of 1011020221 is 1220201101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999255321 + 11764900 = 31611^2 + 3430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011020221 - 2⁷ = 1011020093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011020198 and 1011020207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011020281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505510110 + 505510111.

It is an arithmetic number, because the mean of its divisors is an integer number (505510111).

Almost surely, 2^1011020221 is an apocalyptic number.

It is an amenable number.

1011020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011020221 is an equidigital number, since it uses as much as digits as its factorization.

1011020221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1011020221 is about 31796.5441675664. The cubic root of 1011020221 is about 1003.6599950934.

Adding to 1011020221 its reverse (1220201101), we get a palindrome (2231221322).

It can be divided in two parts, 10110 and 20221, that multiplied together give a triangular number (204434310 = T₂₀₂₂₀).

The spelling of 1011020221 in words is "one billion, eleven million, twenty thousand, two hundred twenty-one".