3644121485021 has 2 divisors, whose sum is σ = 3644121485022. Its totient is φ = 3644121485020.

The previous prime is 3644121484877. The next prime is 3644121485077. The reversal of 3644121485021 is 1205841214463.

It is a happy number.

3644121485021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3270328644025 + 373792840996 = 1808405^2 + 611386^2 .

It is a cyclic number.

It is not a de Polignac number, because 3644121485021 - 2¹⁰ = 3644121483997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3644121485021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3644121484021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822060742510 + 1822060742511.

It is an arithmetic number, because the mean of its divisors is an integer number (1822060742511).

Almost surely, 2^{3644121485021} is an apocalyptic number.

It is an amenable number.

3644121485021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3644121485021 is an equidigital number, since it uses as much as digits as its factorization.

3644121485021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 41.

Adding to 3644121485021 its reverse (1205841214463), we get a palindrome (4849962699484).

The spelling of 3644121485021 in words is "three trillion, six hundred forty-four billion, one hundred twenty-one million, four hundred eighty-five thousand, twenty-one".