4217821380538 has 16 divisors (see below), whose sum is σ = 6328429970184. Its totient is φ = 2108344813120.

The previous prime is 4217821380533. The next prime is 4217821380547. The reversal of 4217821380538 is 8350831287124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3729174245449 + 488647135089 = 1931107^2 + 699033^2 .

It is not an unprimeable number, because it can be changed into a prime (4217821380533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162079968 + ... + 162105988.

Almost surely, 2^{4217821380538} is an apocalyptic number.

4217821380538 is a deficient number, since it is larger than the sum of its proper divisors (2110608589646).

4217821380538 is a wasteful number, since it uses less digits than its factorization.

4217821380538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44657.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 4217821380538 in words is "four trillion, two hundred seventeen billion, eight hundred twenty-one million, three hundred eighty thousand, five hundred thirty-eight".