3445631221 has 4 divisors (see below), whose sum is σ = 3451930912. Its totient is φ = 3439331532.

The previous prime is 3445631191. The next prime is 3445631239. The reversal of 3445631221 is 1221365443.

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: 1221365443 = 53 ⋅23044631.

It is a cyclic number.

It is not a de Polignac number, because 3445631221 - 2¹³ = 3445623029 is a prime.

It is a super-2 number, since 2×3445631221² = 23744749022259901682, 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 (3445631291) 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, 3149025 + ... + 3150118.

It is an arithmetic number, because the mean of its divisors is an integer number (862982728).

Almost surely, 2^3445631221 is an apocalyptic number.

It is an amenable number.

3445631221 is a deficient number, since it is larger than the sum of its proper divisors (6299691).

3445631221 is an equidigital number, since it uses as much as digits as its factorization.

3445631221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6299690.

The product of its digits is 17280, while the sum is 31.

The square root of 3445631221 is about 58699.4993249517. The cubic root of 3445631221 is about 1510.3917263590.

Adding to 3445631221 its reverse (1221365443), we get a palindrome (4666996664).

The spelling of 3445631221 in words is "three billion, four hundred forty-five million, six hundred thirty-one thousand, two hundred twenty-one".