3721321 has 8 divisors (see below), whose sum is σ = 3972320. Its totient is φ = 3475872.

The previous prime is 3721303. The next prime is 3721327. The reversal of 3721321 is 1231273.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3721321 - 2¹¹ = 3719273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 2728.

It is an arithmetic number, because the mean of its divisors is an integer number (496540).

Almost surely, 2^3721321 is an apocalyptic number.

It is an amenable number.

3721321 is a deficient number, since it is larger than the sum of its proper divisors (250999).

3721321 is a wasteful number, since it uses less digits than its factorization.

3721321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775.

The product of its digits is 252, while the sum is 19.

The square root of 3721321 is about 1929.0725750992. The cubic root of 3721321 is about 154.9645565854.

Adding to 3721321 its reverse (1231273), we get a palindrome (4952594).

The spelling of 3721321 in words is "three million, seven hundred twenty-one thousand, three hundred twenty-one".