4435521421 has 2 divisors, whose sum is σ = 4435521422. Its totient is φ = 4435521420.

The previous prime is 4435521407. The next prime is 4435521449. The reversal of 4435521421 is 1241255344.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2264427396 + 2171094025 = 47586^2 + 46595^2 .

It is a cyclic number.

It is not a de Polignac number, because 4435521421 - 2¹¹ = 4435519373 is a prime.

It is a super-2 number, since 2×4435521421² = 39347700552299718482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4435521451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2217760710 + 2217760711.

It is an arithmetic number, because the mean of its divisors is an integer number (2217760711).

Almost surely, 2^4435521421 is an apocalyptic number.

It is an amenable number.

4435521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4435521421 is an equidigital number, since it uses as much as digits as its factorization.

4435521421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 31.

The square root of 4435521421 is about 66599.7103672381. The cubic root of 4435521421 is about 1643.0403423042.

Adding to 4435521421 its reverse (1241255344), we get a palindrome (5676776765).

The spelling of 4435521421 in words is "four billion, four hundred thirty-five million, five hundred twenty-one thousand, four hundred twenty-one".