33213421 has 4 divisors (see below), whose sum is σ = 33475072. Its totient is φ = 32951772.

The previous prime is 33213419. The next prime is 33213437. The reversal of 33213421 is 12431233.

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: 12431233 = 17 ⋅731249.

It is a cyclic number.

It is not a de Polignac number, because 33213421 - 2¹ = 33213419 is a prime.

It is a super-2 number, since 2×33213421² = 2206262669046482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33214421) 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, 130635 + ... + 130888.

It is an arithmetic number, because the mean of its divisors is an integer number (8368768).

Almost surely, 2^33213421 is an apocalyptic number.

It is an amenable number.

33213421 is a deficient number, since it is larger than the sum of its proper divisors (261651).

33213421 is a wasteful number, since it uses less digits than its factorization.

33213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261650.

The product of its digits is 432, while the sum is 19.

The square root of 33213421 is about 5763.1086229569. The cubic root of 33213421 is about 321.4434175671.

Adding to 33213421 its reverse (12431233), we get a palindrome (45644654).

The spelling of 33213421 in words is "thirty-three million, two hundred thirteen thousand, four hundred twenty-one".