33213993 has 4 divisors (see below), whose sum is σ = 44285328. Its totient is φ = 22142660.

The previous prime is 33213979. The next prime is 33213997. The reversal of 33213993 is 39931233.

It is a happy number.

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: 39931233 = 3 ⋅13310411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33213993 is a prime.

It is a super-2 number, since 2×33213993² = 2206338662008098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33213997) 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, 5535663 + ... + 5535668.

It is an arithmetic number, because the mean of its divisors is an integer number (11071332).

Almost surely, 2^33213993 is an apocalyptic number.

It is an amenable number.

33213993 is a deficient number, since it is larger than the sum of its proper divisors (11071335).

33213993 is a wasteful number, since it uses less digits than its factorization.

33213993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11071334.

The product of its digits is 13122, while the sum is 33.

The square root of 33213993 is about 5763.1582487383. The cubic root of 33213993 is about 321.4452628510.

The spelling of 33213993 in words is "thirty-three million, two hundred thirteen thousand, nine hundred ninety-three".