33407021 has 4 divisors (see below), whose sum is σ = 33419100. Its totient is φ = 33394944.

The previous prime is 33407009. The next prime is 33407027. The reversal of 33407021 is 12070433.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26574025 + 6832996 = 5155^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 33407021 - 2⁶ = 33406957 is a prime.

It is a super-2 number, since 2×33407021² = 2232058104188882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 33406984 and 33407002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33407027) 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, 395 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (8354775).

Almost surely, 2^33407021 is an apocalyptic number.

It is an amenable number.

33407021 is a deficient number, since it is larger than the sum of its proper divisors (12079).

33407021 is an equidigital number, since it uses as much as digits as its factorization.

33407021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12078.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 33407021 is about 5779.8807081115. The cubic root of 33407021 is about 322.0667691999.

Adding to 33407021 its reverse (12070433), we get a palindrome (45477454).

The spelling of 33407021 in words is "thirty-three million, four hundred seven thousand, twenty-one".