3686573221 has 4 divisors (see below), whose sum is σ = 3704045344. Its totient is φ = 3669101100.

The previous prime is 3686573201. The next prime is 3686573269. The reversal of 3686573221 is 1223756863.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1223756863 = 7 ⋅174822409.

It is a cyclic number.

It is not a de Polignac number, because 3686573221 - 2¹⁵ = 3686540453 is a prime.

It is a super-2 number, since 2×3686573221² = 27181644227588629682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3686573201) 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, 8735745 + ... + 8736166.

It is an arithmetic number, because the mean of its divisors is an integer number (926011336).

Almost surely, 2^3686573221 is an apocalyptic number.

It is an amenable number.

3686573221 is a deficient number, since it is larger than the sum of its proper divisors (17472123).

3686573221 is a wasteful number, since it uses less digits than its factorization.

3686573221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17472122.

The product of its digits is 362880, while the sum is 43.

The square root of 3686573221 is about 60717.1575503992. The cubic root of 3686573221 is about 1544.8072110312.

The spelling of 3686573221 in words is "three billion, six hundred eighty-six million, five hundred seventy-three thousand, two hundred twenty-one".