1001024021 has 2 divisors, whose sum is σ = 1001024022. Its totient is φ = 1001024020.

The previous prime is 1001023997. The next prime is 1001024041. The reversal of 1001024021 is 1204201001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703840900 + 297183121 = 26530^2 + 17239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001024021 - 2⁶ = 1001023957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001023993 and 1001024011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001024041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500512010 + 500512011.

It is an arithmetic number, because the mean of its divisors is an integer number (500512011).

Almost surely, 2^1001024021 is an apocalyptic number.

It is an amenable number.

1001024021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001024021 is an equidigital number, since it uses as much as digits as its factorization.

1001024021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1001024021 is about 31638.9636524334. The cubic root of 1001024021 is about 1000.3412238863.

Adding to 1001024021 its reverse (1204201001), we get a palindrome (2205225022).

The spelling of 1001024021 in words is "one billion, one million, twenty-four thousand, twenty-one".