1030123021 has 4 divisors (see below), whose sum is σ = 1032502492. Its totient is φ = 1027743552.

The previous prime is 1030123013. The next prime is 1030123027. The reversal of 1030123021 is 1203210301.

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 645414025 + 384708996 = 25405^2 + 19614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1030123021 - 2³ = 1030123013 is a prime.

It is a super-2 number, since 2×1030123021² = 2122306876788332882, 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 = 1030122992 and 1030123010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1030123027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1189086 + ... + 1189951.

It is an arithmetic number, because the mean of its divisors is an integer number (258125623).

Almost surely, 2^1030123021 is an apocalyptic number.

It is an amenable number.

1030123021 is a deficient number, since it is larger than the sum of its proper divisors (2379471).

1030123021 is an equidigital number, since it uses as much as digits as its factorization.

1030123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379470.

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

The square root of 1030123021 is about 32095.5296108352. The cubic root of 1030123021 is about 1009.9418392807.

Adding to 1030123021 its reverse (1203210301), we get a palindrome (2233333322).

The spelling of 1030123021 in words is "one billion, thirty million, one hundred twenty-three thousand, twenty-one".