4021521653 has 2 divisors, whose sum is σ = 4021521654. Its totient is φ = 4021521652.

The previous prime is 4021521607. The next prime is 4021521659. The reversal of 4021521653 is 3561251204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2694959569 + 1326562084 = 51913^2 + 36422^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021521653 - 2¹⁴ = 4021505269 is a prime.

It is a super-3 number, since 3×4021521653³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021521659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010760826 + 2010760827.

It is an arithmetic number, because the mean of its divisors is an integer number (2010760827).

Almost surely, 2^4021521653 is an apocalyptic number.

It is an amenable number.

4021521653 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021521653 is an equidigital number, since it uses as much as digits as its factorization.

4021521653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 4021521653 is about 63415.4685624888. The cubic root of 4021521653 is about 1590.2429191236.

Adding to 4021521653 its reverse (3561251204), we get a palindrome (7582772857).

The spelling of 4021521653 in words is "four billion, twenty-one million, five hundred twenty-one thousand, six hundred fifty-three".