4197561041821 has 16 divisors (see below), whose sum is σ = 5167132326400. Its totient is φ = 3329277296688.

The previous prime is 4197561041731. The next prime is 4197561041867. The reversal of 4197561041821 is 1281401657914.

It is not a de Polignac number, because 4197561041821 - 2¹⁹ = 4197560517533 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 (4197561041881) 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 15 ways as a sum of consecutive naturals, for example, 366978111 + ... + 366989548.

It is an arithmetic number, because the mean of its divisors is an integer number (322945770400).

Almost surely, 2^{4197561041821} is an apocalyptic number.

It is an amenable number.

4197561041821 is a deficient number, since it is larger than the sum of its proper divisors (969571284579).

4197561041821 is a wasteful number, since it uses less digits than its factorization.

4197561041821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733967728.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 4197561041821 in words is "four trillion, one hundred ninety-seven billion, five hundred sixty-one million, forty-one thousand, eight hundred twenty-one".