33387121 has 4 divisors (see below), whose sum is σ = 33401200. Its totient is φ = 33373044.

The previous prime is 33387083. The next prime is 33387131. The reversal of 33387121 is 12178333.

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: 12178333 = 157 ⋅77569.

It is a cyclic number.

It is not a de Polignac number, because 33387121 - 2⁷ = 33386993 is a prime.

It is a super-2 number, since 2×33387121² = 2229399697337282, 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 33387121.

It is not an unprimeable number, because it can be changed into a prime (33387131) 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, 2511 + ... + 8548.

It is an arithmetic number, because the mean of its divisors is an integer number (8350300).

Almost surely, 2^33387121 is an apocalyptic number.

It is an amenable number.

33387121 is a deficient number, since it is larger than the sum of its proper divisors (14079).

33387121 is a wasteful number, since it uses less digits than its factorization.

33387121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14078.

The product of its digits is 3024, while the sum is 28.

The square root of 33387121 is about 5778.1589628531. The cubic root of 33387121 is about 322.0028065802.

The spelling of 33387121 in words is "thirty-three million, three hundred eighty-seven thousand, one hundred twenty-one".