3705421221 has 12 divisors (see below), whose sum is σ = 5550507872. Its totient is φ = 2470280652.

The previous prime is 3705421177. The next prime is 3705421253. The reversal of 3705421221 is 1221245073.

3705421221 is a `hidden beast` number, since 370 + 54 + 21 + 221 = 666.

It is not a de Polignac number, because 3705421221 - 2⁶ = 3705421157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3705421261) 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 11 ways as a sum of consecutive naturals, for example, 7624081 + ... + 7624566.

Almost surely, 2^3705421221 is an apocalyptic number.

It is an amenable number.

3705421221 is a deficient number, since it is larger than the sum of its proper divisors (1845086651).

3705421221 is an equidigital number, since it uses as much as digits as its factorization.

3705421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15248662 (or 15248650 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 3705421221 is about 60872.1711539846. The cubic root of 3705421221 is about 1547.4354011850.

Adding to 3705421221 its reverse (1221245073), we get a palindrome (4926666294).

The spelling of 3705421221 in words is "three billion, seven hundred five million, four hundred twenty-one thousand, two hundred twenty-one".