1002105421 has 2 divisors, whose sum is σ = 1002105422. Its totient is φ = 1002105420.

The previous prime is 1002105407. The next prime is 1002105449. The reversal of 1002105421 is 1245012001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995402500 + 6702921 = 31550^2 + 2589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002105421 - 2⁵ = 1002105389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002105395 and 1002105404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002105491) 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 as a sum of consecutive naturals, namely, 501052710 + 501052711.

It is an arithmetic number, because the mean of its divisors is an integer number (501052711).

Almost surely, 2^1002105421 is an apocalyptic number.

It is an amenable number.

1002105421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002105421 is an equidigital number, since it uses as much as digits as its factorization.

1002105421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1002105421 is about 31656.0487269021. The cubic root of 1002105421 is about 1000.7013150422.

Adding to 1002105421 its reverse (1245012001), we get a palindrome (2247117422).

The spelling of 1002105421 in words is "one billion, two million, one hundred five thousand, four hundred twenty-one".