1051021 has 4 divisors (see below), whose sum is σ = 1054044. Its totient is φ = 1048000.

The previous prime is 1051019. The next prime is 1051027. The reversal of 1051021 is 1201501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 978121 + 72900 = 989^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051021 - 2¹ = 1051019 is a prime.

It is a super-2 number, since 2×1051021² = 2209290284882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1050989 and 1051007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051027) 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 3 ways as a sum of consecutive naturals, for example, 910 + ... + 1711.

It is an arithmetic number, because the mean of its divisors is an integer number (263511).

2^1051021 is an apocalyptic number.

It is an amenable number.

1051021 is a deficient number, since it is larger than the sum of its proper divisors (3023).

1051021 is an equidigital number, since it uses as much as digits as its factorization.

1051021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022.

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

The square root of 1051021 is about 1025.1931525327. The cubic root of 1051021 is about 101.6725691577.

Adding to 1051021 its reverse (1201501), we get a palindrome (2252522).

The spelling of 1051021 in words is "one million, fifty-one thousand, twenty-one".