4121635421 has 8 divisors (see below), whose sum is σ = 4161636600. Its totient is φ = 4081674240.

The previous prime is 4121635409. The next prime is 4121635423. The reversal of 4121635421 is 1245361214.

It can be written as a sum of positive squares in 4 ways, for example, as 338155321 + 3783480100 = 18389^2 + 61510^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4121635421 - 2²⁶ = 4054526557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4121635423) 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 in 7 ways as a sum of consecutive naturals, for example, 223181 + ... + 240941.

It is an arithmetic number, because the mean of its divisors is an integer number (520204575).

Almost surely, 2^4121635421 is an apocalyptic number.

It is an amenable number.

4121635421 is a deficient number, since it is larger than the sum of its proper divisors (40001179).

4121635421 is a wasteful number, since it uses less digits than its factorization.

4121635421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19999.

The product of its digits is 5760, while the sum is 29.

The square root of 4121635421 is about 64199.9643379963. The cubic root of 4121635421 is about 1603.3310058802.

Adding to 4121635421 its reverse (1245361214), we get a palindrome (5366996635).

The spelling of 4121635421 in words is "four billion, one hundred twenty-one million, six hundred thirty-five thousand, four hundred twenty-one".