1021081 has 2 divisors, whose sum is σ = 1021082.
Its totient is φ = 1021080.
The previous prime is 1021073. The next prime is 1021087. The reversal of 1021081 is 1801201.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 518400 + 502681 = 720^2 + 709^2
It is a cyclic number.
It is not a de Polignac number, because 1021081 - 23 = 1021073 is a prime.
It is a super-2 number, since 2×10210812 = 2085212817122, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (1021087) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510540 + 510541.
It is an arithmetic number, because the mean of its divisors is an integer number (510541).
21021081 is an apocalyptic number.
It is an amenable number.
1021081 is a deficient number, since it is larger than the sum of its proper divisors (1).
1021081 is an equidigital number, since it uses as much as digits as its factorization.
1021081 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 16, while the sum is 13.
The square root of 1021081 is about 1010.4855268632.
The cubic root of 1021081 is about 100.6978191574.
Adding to 1021081 its reverse (1801201), we get a palindrome (2822282).
The spelling of 1021081 in words is "one million, twenty-one thousand, eighty-one".