1050021 has 18 divisors (see below), whose sum is σ = 1765062. Its totient is φ = 599760.

The previous prime is 1050013. The next prime is 1050031. The reversal of 1050021 is 1200501.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 509796 = 735^2 + 714^2 .

It is not a de Polignac number, because 1050021 - 2³ = 1050013 is a prime.

It is a super-2 number, since 2×1050021² = 2205088200882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1049985 and 1050012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1050011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 750 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (98059).

2^1050021 is an apocalyptic number.

It is an amenable number.

1050021 is a deficient number, since it is larger than the sum of its proper divisors (715041).

1050021 is a wasteful number, since it uses less digits than its factorization.

1050021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401 (or 2391 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1050021 is about 1024.7053234955. The cubic root of 1050021 is about 101.6403132745.

Adding to 1050021 its reverse (1200501), we get a palindrome (2250522).

The spelling of 1050021 in words is "one million, fifty thousand, twenty-one".