3561130021 has 2 divisors, whose sum is σ = 3561130022. Its totient is φ = 3561130020.

The previous prime is 3561129959. The next prime is 3561130103. The reversal of 3561130021 is 1200311653.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3423537121 + 137592900 = 58511^2 + 11730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3561130021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3561129974 and 3561130001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3561130621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780565010 + 1780565011.

It is an arithmetic number, because the mean of its divisors is an integer number (1780565011).

Almost surely, 2^3561130021 is an apocalyptic number.

It is an amenable number.

3561130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561130021 is an equidigital number, since it uses as much as digits as its factorization.

3561130021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 3561130021 is about 59675.2044068556. The cubic root of 3561130021 is about 1527.0828864943.

Adding to 3561130021 its reverse (1200311653), we get a palindrome (4761441674).

The spelling of 3561130021 in words is "three billion, five hundred sixty-one million, one hundred thirty thousand, twenty-one".