1030021021 has 4 divisors (see below), whose sum is σ = 1044130972. Its totient is φ = 1015911072.

The previous prime is 1030021019. The next prime is 1030021033. The reversal of 1030021021 is 1201200301.

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 218625796 + 811395225 = 14786^2 + 28485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1030021021 - 2¹ = 1030021019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1030020989 and 1030021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1030021081) 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, 7054866 + ... + 7055011.

It is an arithmetic number, because the mean of its divisors is an integer number (261032743).

Almost surely, 2^1030021021 is an apocalyptic number.

It is an amenable number.

1030021021 is a deficient number, since it is larger than the sum of its proper divisors (14109951).

1030021021 is an equidigital number, since it uses as much as digits as its factorization.

1030021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14109950.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1030021021 is about 32093.9405651596. The cubic root of 1030021021 is about 1009.9085042758.

Adding to 1030021021 its reverse (1201200301), we get a palindrome (2231221322).

The spelling of 1030021021 in words is "one billion, thirty million, twenty-one thousand, twenty-one".