163033421 has 2 divisors, whose sum is σ = 163033422. Its totient is φ = 163033420.

The previous prime is 163033411. The next prime is 163033441. The reversal of 163033421 is 124330361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162690025 + 343396 = 12755^2 + 586^2 .

It is an emirp because it is prime and its reverse (124330361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163033421 - 2²² = 158839117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163033411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81516710 + 81516711.

It is an arithmetic number, because the mean of its divisors is an integer number (81516711).

Almost surely, 2^163033421 is an apocalyptic number.

It is an amenable number.

163033421 is a deficient number, since it is larger than the sum of its proper divisors (1).

163033421 is an equidigital number, since it uses as much as digits as its factorization.

163033421 is an evil number, because the sum of its binary digits is even.

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

The square root of 163033421 is about 12768.4541350940. The cubic root of 163033421 is about 546.2928887424.

Adding to 163033421 its reverse (124330361), we get a palindrome (287363782).

The spelling of 163033421 in words is "one hundred sixty-three million, thirty-three thousand, four hundred twenty-one".