33136421 has 2 divisors, whose sum is σ = 33136422. Its totient is φ = 33136420.

The previous prime is 33136403. The next prime is 33136429. The reversal of 33136421 is 12463133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 13653025 = 4414^2 + 3695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33136421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33136429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16568210 + 16568211.

It is an arithmetic number, because the mean of its divisors is an integer number (16568211).

Almost surely, 2^33136421 is an apocalyptic number.

It is an amenable number.

33136421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33136421 is an equidigital number, since it uses as much as digits as its factorization.

33136421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

The square root of 33136421 is about 5756.4243241790. The cubic root of 33136421 is about 321.1948203207.

Adding to 33136421 its reverse (12463133), we get a palindrome (45599554).

The spelling of 33136421 in words is "thirty-three million, one hundred thirty-six thousand, four hundred twenty-one".