33421213 has 4 divisors (see below), whose sum is σ = 38195680. Its totient is φ = 28646748.

The previous prime is 33421189. The next prime is 33421237. The reversal of 33421213 is 31212433.

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: 31212433 = 7 ⋅4458919.

It is an interprime number because it is at equal distance from previous prime (33421189) and next prime (33421237).

It is a cyclic number.

It is not a de Polignac number, because 33421213 - 2⁵ = 33421181 is a prime.

It is a super-2 number, since 2×33421213² = 2233954956782738, 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 (33421613) 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, 2387223 + ... + 2387236.

It is an arithmetic number, because the mean of its divisors is an integer number (9548920).

Almost surely, 2^33421213 is an apocalyptic number.

It is an amenable number.

33421213 is a deficient number, since it is larger than the sum of its proper divisors (4774467).

33421213 is an equidigital number, since it uses as much as digits as its factorization.

33421213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774466.

The product of its digits is 432, while the sum is 19.

The square root of 33421213 is about 5781.1082847496. The cubic root of 33421213 is about 322.1123696390.

Adding to 33421213 its reverse (31212433), we get a palindrome (64633646).

The spelling of 33421213 in words is "thirty-three million, four hundred twenty-one thousand, two hundred thirteen".