3512221 has 4 divisors (see below), whose sum is σ = 3518944. Its totient is φ = 3505500.

The previous prime is 3512213. The next prime is 3512227. The reversal of 3512221 is 1222153.

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: 1222153 = 383 ⋅3191.

It is a cyclic number.

It is not a de Polignac number, because 3512221 - 2³ = 3512213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3512195 and 3512204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3512227) 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, 2505 + ... + 3646.

It is an arithmetic number, because the mean of its divisors is an integer number (879736).

Almost surely, 2^3512221 is an apocalyptic number.

It is an amenable number.

3512221 is a deficient number, since it is larger than the sum of its proper divisors (6723).

3512221 is an equidigital number, since it uses as much as digits as its factorization.

3512221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722.

The product of its digits is 120, while the sum is 16.

The square root of 3512221 is about 1874.0920468323. The cubic root of 3512221 is about 152.0059583306.

Adding to 3512221 its reverse (1222153), we get a palindrome (4734374).

The spelling of 3512221 in words is "three million, five hundred twelve thousand, two hundred twenty-one".