33145405021 has 2 divisors, whose sum is σ = 33145405022.
Its totient is φ = 33145405020.
The previous prime is 33145404997. The next prime is 33145405037. The reversal of 33145405021 is 12050454133.
Adding to 33145405021 its reverse (12050454133), we get a palindrome (45195859154).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 31228191225 + 1917213796 = 176715^2 + 43786^2
It is a cyclic number.
It is not a de Polignac number, because 33145405021 - 213 = 33145396829 is a prime.
It is a super-2 number, since 2×331454050212 (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 (33145405081) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16572702510 + 16572702511.
It is an arithmetic number, because the mean of its divisors is an integer number (16572702511).
Almost surely, 233145405021 is an apocalyptic number.
It is an amenable number.
33145405021 is a deficient number, since it is larger than the sum of its proper divisors (1).
33145405021 is an equidigital number, since it uses as much as digits as its factorization.
33145405021 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 7200, while the sum is 28.
The spelling of 33145405021 in words is "thirty-three billion, one hundred forty-five million, four hundred five thousand, twenty-one".