1030388021 has 4 divisors (see below), whose sum is σ = 1109648652. Its totient is φ = 951127392.

The previous prime is 1030388011. The next prime is 1030388041. The reversal of 1030388021 is 1208830301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1208830301 = 7 ⋅172690043.

It can be written as a sum of positive squares in 2 ways, for example, as 675480100 + 354907921 = 25990^2 + 18839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1030388021 - 2²² = 1026193717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1030388011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39630296 + ... + 39630321.

It is an arithmetic number, because the mean of its divisors is an integer number (277412163).

Almost surely, 2^1030388021 is an apocalyptic number.

It is an amenable number.

1030388021 is a deficient number, since it is larger than the sum of its proper divisors (79260631).

1030388021 is an equidigital number, since it uses as much as digits as its factorization.

1030388021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79260630.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1030388021 is about 32099.6576461494. The cubic root of 1030388021 is about 1010.0284346470.

The spelling of 1030388021 in words is "one billion, thirty million, three hundred eighty-eight thousand, twenty-one".