33330166421 has 2 divisors, whose sum is σ = 33330166422. Its totient is φ = 33330166420.

The previous prime is 33330166417. The next prime is 33330166537. The reversal of 33330166421 is 12466103333.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18662292100 + 14667874321 = 136610^2 + 121111^2 .

It is a cyclic number.

It is not a de Polignac number, because 33330166421 - 2² = 33330166417 is a prime.

It is a super-2 number, since 2×33330166421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33330166721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16665083210 + 16665083211.

It is an arithmetic number, because the mean of its divisors is an integer number (16665083211).

Almost surely, 2^33330166421 is an apocalyptic number.

It is an amenable number.

33330166421 is a deficient number, since it is larger than the sum of its proper divisors (1).

33330166421 is an equidigital number, since it uses as much as digits as its factorization.

33330166421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 32.

Adding to 33330166421 its reverse (12466103333), we get a palindrome (45796269754).

The spelling of 33330166421 in words is "thirty-three billion, three hundred thirty million, one hundred sixty-six thousand, four hundred twenty-one".