33223021 has 4 divisors (see below), whose sum is σ = 35778652. Its totient is φ = 30667392.

The previous prime is 33223019. The next prime is 33223027. The reversal of 33223021 is 12032233.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19900521 + 13322500 = 4461^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 33223021 - 2¹ = 33223019 is a prime.

It is a super-2 number, since 2×33223021² = 2207538248732882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33222986 and 33223004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33223027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277796 + ... + 1277821.

It is an arithmetic number, because the mean of its divisors is an integer number (8944663).

Almost surely, 2^33223021 is an apocalyptic number.

It is an amenable number.

33223021 is a deficient number, since it is larger than the sum of its proper divisors (2555631).

33223021 is a wasteful number, since it uses less digits than its factorization.

33223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555630.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 33223021 is about 5763.9414466145. The cubic root of 33223021 is about 321.4743845623.

Adding to 33223021 its reverse (12032233), we get a palindrome (45255254).

The spelling of 33223021 in words is "thirty-three million, two hundred twenty-three thousand, twenty-one".