33143601221 has 2 divisors, whose sum is σ = 33143601222. Its totient is φ = 33143601220.

The previous prime is 33143601203. The next prime is 33143601233. The reversal of 33143601221 is 12210634133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18740241025 + 14403360196 = 136895^2 + 120014^2 .

It is an emirp because it is prime and its reverse (12210634133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33143601221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33143601241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16571800610 + 16571800611.

It is an arithmetic number, because the mean of its divisors is an integer number (16571800611).

Almost surely, 2^33143601221 is an apocalyptic number.

It is an amenable number.

33143601221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33143601221 is an equidigital number, since it uses as much as digits as its factorization.

33143601221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 33143601221 in words is "thirty-three billion, one hundred forty-three million, six hundred one thousand, two hundred twenty-one".