33543421 has 2 divisors, whose sum is σ = 33543422. Its totient is φ = 33543420.

The previous prime is 33543373. The next prime is 33543439. The reversal of 33543421 is 12434533.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33524100 + 19321 = 5790^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 33543421 - 2²³ = 25154813 is a prime.

It is a super-2 number, since 2×33543421² = 2250322184766482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33543481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16771710 + 16771711.

It is an arithmetic number, because the mean of its divisors is an integer number (16771711).

Almost surely, 2^33543421 is an apocalyptic number.

It is an amenable number.

33543421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33543421 is an equidigital number, since it uses as much as digits as its factorization.

33543421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 25.

The square root of 33543421 is about 5791.6682398079. The cubic root of 33543421 is about 322.5045040735.

Adding to 33543421 its reverse (12434533), we get a palindrome (45977954).

The spelling of 33543421 in words is "thirty-three million, five hundred forty-three thousand, four hundred twenty-one".