1023310021 has 4 divisors (see below), whose sum is σ = 1048268844. Its totient is φ = 998351200.

The previous prime is 1023310009. The next prime is 1023310039. The reversal of 1023310021 is 1200133201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200133201 = 1433 ⋅837497.

It can be written as a sum of positive squares in 2 ways, for example, as 137592900 + 885717121 = 11730^2 + 29761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023310021 - 2¹⁵ = 1023277253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023309983 and 1023310010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023310091) 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 3 ways as a sum of consecutive naturals, for example, 12479350 + ... + 12479431.

It is an arithmetic number, because the mean of its divisors is an integer number (262067211).

Almost surely, 2^1023310021 is an apocalyptic number.

It is an amenable number.

1023310021 is a deficient number, since it is larger than the sum of its proper divisors (24958823).

1023310021 is an equidigital number, since it uses as much as digits as its factorization.

1023310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24958822.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1023310021 is about 31989.2172614461. The cubic root of 1023310021 is about 1007.7104038767.

Adding to 1023310021 its reverse (1200133201), we get a palindrome (2223443222).

The spelling of 1023310021 in words is "one billion, twenty-three million, three hundred ten thousand, twenty-one".