3681370021 has 4 divisors (see below), whose sum is σ = 4207280032. Its totient is φ = 3155460012.

The previous prime is 3681369977. The next prime is 3681370039. The reversal of 3681370021 is 1200731863.

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 cyclic number.

It is not a de Polignac number, because 3681370021 - 2⁹ = 3681369509 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 (3681370321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262954995 + ... + 262955008.

It is an arithmetic number, because the mean of its divisors is an integer number (1051820008).

Almost surely, 2^3681370021 is an apocalyptic number.

It is an amenable number.

3681370021 is a deficient number, since it is larger than the sum of its proper divisors (525910011).

3681370021 is an equidigital number, since it uses as much as digits as its factorization.

3681370021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525910010.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 3681370021 is about 60674.2945653264. The cubic root of 3681370021 is about 1544.0800926543.

The spelling of 3681370021 in words is "three billion, six hundred eighty-one million, three hundred seventy thousand, twenty-one".