33506421 has 16 divisors (see below), whose sum is σ = 48543936. Its totient is φ = 20434176.

The previous prime is 33506413. The next prime is 33506461. The reversal of 33506421 is 12460533.

It is a happy number.

It is not a de Polignac number, because 33506421 - 2³ = 33506413 is a prime.

It is a super-2 number, since 2×33506421² = 2245360496458482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 33506391 and 33506400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33506401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606 + ... + 8208.

It is an arithmetic number, because the mean of its divisors is an integer number (3033996).

Almost surely, 2^33506421 is an apocalyptic number.

It is an amenable number.

33506421 is a deficient number, since it is larger than the sum of its proper divisors (15037515).

33506421 is a wasteful number, since it uses less digits than its factorization.

33506421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7732.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 33506421 is about 5788.4731147341. The cubic root of 33506421 is about 322.3858811422.

Adding to 33506421 its reverse (12460533), we get a palindrome (45966954).

The spelling of 33506421 in words is "thirty-three million, five hundred six thousand, four hundred twenty-one".