33442421 has 2 divisors, whose sum is σ = 33442422. Its totient is φ = 33442420.

The previous prime is 33442363. The next prime is 33442441. The reversal of 33442421 is 12424433.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27615025 + 5827396 = 5255^2 + 2414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33442421 is a prime.

It is a super-2 number, since 2×33442421² = 2236791044682482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33442441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16721210 + 16721211.

It is an arithmetic number, because the mean of its divisors is an integer number (16721211).

Almost surely, 2^33442421 is an apocalyptic number.

It is an amenable number.

33442421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33442421 is an equidigital number, since it uses as much as digits as its factorization.

33442421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 23.

The square root of 33442421 is about 5782.9422442214. The cubic root of 33442421 is about 322.1804891959.

Adding to 33442421 its reverse (12424433), we get a palindrome (45866854).

The spelling of 33442421 in words is "thirty-three million, four hundred forty-two thousand, four hundred twenty-one".