1023021 has 12 divisors (see below), whose sum is σ = 1487772. Its totient is φ = 677376.

The previous prime is 1023019. The next prime is 1023037. The reversal of 1023021 is 1203201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1010025 + 12996 = 1005^2 + 114^2 .

It is not a de Polignac number, because 1023021 - 2¹ = 1023019 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1022994 and 1023012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1485 + ... + 2061.

It is an arithmetic number, because the mean of its divisors is an integer number (123981).

2^1023021 is an apocalyptic number.

It is an amenable number.

1023021 is a deficient number, since it is larger than the sum of its proper divisors (464751).

1023021 is a wasteful number, since it uses less digits than its factorization.

1023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1023021 is about 1011.4450059197. The cubic root of 1023021 is about 100.7615523249.

Adding to 1023021 its reverse (1203201), we get a palindrome (2226222).

The spelling of 1023021 in words is "one million, twenty-three thousand, twenty-one".