42204121 has 2 divisors, whose sum is σ = 42204122. Its totient is φ = 42204120.

The previous prime is 42204109. The next prime is 42204133. The reversal of 42204121 is 12140224.

It is a balanced prime because it is at equal distance from previous prime (42204109) and next prime (42204133).

It can be written as a sum of positive squares in only one way, i.e., 40144896 + 2059225 = 6336^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 42204121 - 2²⁵ = 8649689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42204095 and 42204104.

It is not a weakly prime, because it can be changed into another prime (42204181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21102060 + 21102061.

It is an arithmetic number, because the mean of its divisors is an integer number (21102061).

Almost surely, 2^42204121 is an apocalyptic number.

It is an amenable number.

42204121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42204121 is an equidigital number, since it uses as much as digits as its factorization.

42204121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 42204121 is about 6496.4698875620. The cubic root of 42204121 is about 348.1648737617.

Adding to 42204121 its reverse (12140224), we get a palindrome (54344345).

The spelling of 42204121 in words is "forty-two million, two hundred four thousand, one hundred twenty-one".