1023020021 has 8 divisors (see below), whose sum is σ = 1077160800. Its totient is φ = 968909040.

The previous prime is 1023019997. The next prime is 1023020039. The reversal of 1023020021 is 1200203201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023019984 and 1023020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023020041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113675 + ... + 122343.

It is an arithmetic number, because the mean of its divisors is an integer number (134645100).

Almost surely, 2^1023020021 is an apocalyptic number.

It is an amenable number.

1023020021 is a deficient number, since it is larger than the sum of its proper divisors (54140779).

1023020021 is an equidigital number, since it uses as much as digits as its factorization.

1023020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14899.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1023020021 is about 31984.6841628927. The cubic root of 1023020021 is about 1007.6152018293.

Adding to 1023020021 its reverse (1200203201), we get a palindrome (2223223222).

The spelling of 1023020021 in words is "one billion, twenty-three million, twenty thousand, twenty-one".