42002133221 has 4 divisors (see below), whose sum is σ = 42690692844. Its totient is φ = 41313573600.

The previous prime is 42002133163. The next prime is 42002133263. The reversal of 42002133221 is 12233120024.

42002133221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23108256196 + 18893877025 = 152014^2 + 137455^2 .

It is a cyclic number.

It is not a de Polignac number, because 42002133221 - 2⁶ = 42002133157 is a prime.

It is a super-2 number, since 2×42002133221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42002133193 and 42002133202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42002130221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344279720 + ... + 344279841.

It is an arithmetic number, because the mean of its divisors is an integer number (10672673211).

Almost surely, 2^42002133221 is an apocalyptic number.

It is an amenable number.

42002133221 is a deficient number, since it is larger than the sum of its proper divisors (688559623).

42002133221 is an equidigital number, since it uses as much as digits as its factorization.

42002133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688559622.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 42002133221 its reverse (12233120024), we get a palindrome (54235253245).

The spelling of 42002133221 in words is "forty-two billion, two million, one hundred thirty-three thousand, two hundred twenty-one".