33621213 has 8 divisors (see below), whose sum is σ = 44908288. Its totient is φ = 22374144.

The previous prime is 33621173. The next prime is 33621233. The reversal of 33621213 is 31212633.

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

It is not a de Polignac number, because 33621213 - 2⁶ = 33621149 is a prime.

It is a super-2 number, since 2×33621213² = 2260771927182738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33621213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33621233) 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, 7981 + ... + 11442.

It is an arithmetic number, because the mean of its divisors is an integer number (5613536).

Almost surely, 2^33621213 is an apocalyptic number.

It is an amenable number.

33621213 is a deficient number, since it is larger than the sum of its proper divisors (11287075).

33621213 is a wasteful number, since it uses less digits than its factorization.

33621213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20003.

The product of its digits is 648, while the sum is 21.

The square root of 33621213 is about 5798.3802048503. The cubic root of 33621213 is about 322.7536229782.

Adding to 33621213 its reverse (31212633), we get a palindrome (64833846).

The spelling of 33621213 in words is "thirty-three million, six hundred twenty-one thousand, two hundred thirteen".