3321621 has 16 divisors (see below), whose sum is σ = 5037120. Its totient is φ = 2162160.

The previous prime is 3321611. The next prime is 3321623. The reversal of 3321621 is 1261233.

It is not a de Polignac number, because 3321621 - 2⁵ = 3321589 is a prime.

It is a super-2 number, since 2×3321621² = 22066332135282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3321594 and 3321603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3321623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270 + ... + 2591.

It is an arithmetic number, because the mean of its divisors is an integer number (314820).

Almost surely, 2^3321621 is an apocalyptic number.

It is an amenable number.

3321621 is a deficient number, since it is larger than the sum of its proper divisors (1715499).

3321621 is a wasteful number, since it uses less digits than its factorization.

3321621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913 (or 2907 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 3321621 is about 1822.5314812096. The cubic root of 3321621 is about 149.2049938791.

Adding to 3321621 its reverse (1261233), we get a palindrome (4582854).

It can be divided in two parts, 332 and 1621, that added together give a triangular number (1953 = T₆₂).

The spelling of 3321621 in words is "three million, three hundred twenty-one thousand, six hundred twenty-one".