33154021 has 2 divisors, whose sum is σ = 33154022. Its totient is φ = 33154020.

The previous prime is 33154007. The next prime is 33154039. The reversal of 33154021 is 12045133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33005025 + 148996 = 5745^2 + 386^2 .

It is an emirp because it is prime and its reverse (12045133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33154021 - 2⁹ = 33153509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33154021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33154061) 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 as a sum of consecutive naturals, namely, 16577010 + 16577011.

It is an arithmetic number, because the mean of its divisors is an integer number (16577011).

Almost surely, 2^33154021 is an apocalyptic number.

It is an amenable number.

33154021 is a deficient number, since it is larger than the sum of its proper divisors (1).

33154021 is an equidigital number, since it uses as much as digits as its factorization.

33154021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 33154021 is about 5757.9528480181. The cubic root of 33154021 is about 321.2516764739.

Adding to 33154021 its reverse (12045133), we get a palindrome (45199154).

The spelling of 33154021 in words is "thirty-three million, one hundred fifty-four thousand, twenty-one".