3781295021 has 4 divisors (see below), whose sum is σ = 4321480032. Its totient is φ = 3241110012.

The previous prime is 3781294969. The next prime is 3781295047. The reversal of 3781295021 is 1205921873.

3781295021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-3781295021 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 (3781285021) 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, 270092495 + ... + 270092508.

It is an arithmetic number, because the mean of its divisors is an integer number (1080370008).

Almost surely, 2^3781295021 is an apocalyptic number.

It is an amenable number.

3781295021 is a deficient number, since it is larger than the sum of its proper divisors (540185011).

3781295021 is an equidigital number, since it uses as much as digits as its factorization.

3781295021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540185010.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 3781295021 is about 61492.2354529415. The cubic root of 3781295021 is about 1557.9261041302.

The spelling of 3781295021 in words is "three billion, seven hundred eighty-one million, two hundred ninety-five thousand, twenty-one".