3644121484021 has 2 divisors, whose sum is σ = 3644121484022. Its totient is φ = 3644121484020.

The previous prime is 3644121483997. The next prime is 3644121484027. The reversal of 3644121484021 is 1204841214463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3492559207921 + 151562276100 = 1868839^2 + 389310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3644121484021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3644121484027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822060742010 + 1822060742011.

It is an arithmetic number, because the mean of its divisors is an integer number (1822060742011).

Almost surely, 2^{3644121484021} is an apocalyptic number.

It is an amenable number.

3644121484021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3644121484021 is an equidigital number, since it uses as much as digits as its factorization.

3644121484021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 40.

Adding to 3644121484021 its reverse (1204841214463), we get a palindrome (4848962698484).

The spelling of 3644121484021 in words is "three trillion, six hundred forty-four billion, one hundred twenty-one million, four hundred eighty-four thousand, twenty-one".