3783371217921 has 45 divisors (see below), whose sum is σ = 6004184134201. Its totient is φ = 2373693251328.

The previous prime is 3783371217907. The next prime is 3783371217971. The reversal of 3783371217921 is 1297121733873.

The square root of 3783371217921 is 1945089.

It is a perfect power (a square), and thus also a powerful number.

3783371217921 is a `hidden beast` number, since 3 + 7 + 8 + 337 + 1 + 217 + 92 + 1 = 666.

3783371217921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2134407043521 + 1648964174400 = 1460961^2 + 1284120^2 .

It is not a de Polignac number, because 3783371217921 - 2⁷ = 3783371217793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3783371217971) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 297592261 + ... + 297604973.

Almost surely, 2^{3783371217921} is an apocalyptic number.

3783371217921 is the 1945089-th square number.

3783371217921 is the 972545-th centered octagonal number.

It is an amenable number.

3783371217921 is a deficient number, since it is larger than the sum of its proper divisors (2220812916280).

3783371217921 is an frugal number, since it uses more digits than its factorization.

3783371217921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25472 (or 12733 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The spelling of 3783371217921 in words is "three trillion, seven hundred eighty-three billion, three hundred seventy-one million, two hundred seventeen thousand, nine hundred twenty-one".