3953602241821 has 4 divisors (see below), whose sum is σ = 3953645740444. Its totient is φ = 3953558743200.

The previous prime is 3953602241723. The next prime is 3953602241833. The reversal of 3953602241821 is 1281422063593.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2237866402500 + 1715735839321 = 1495950^2 + 1309861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3953602241821 is a prime.

It is a super-2 number, since 2×3953602241821² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3953600241821) 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 3 ways as a sum of consecutive naturals, for example, 21612690 + ... + 21794851.

It is an arithmetic number, because the mean of its divisors is an integer number (988411435111).

Almost surely, 2^{3953602241821} is an apocalyptic number.

It is an amenable number.

3953602241821 is a deficient number, since it is larger than the sum of its proper divisors (43498623).

3953602241821 is an equidigital number, since it uses as much as digits as its factorization.

3953602241821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43498622.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 3953602241821 in words is "three trillion, nine hundred fifty-three billion, six hundred two million, two hundred forty-one thousand, eight hundred twenty-one".