42121304225 has 48 divisors (see below), whose sum is σ = 70127594880. Its totient is φ = 24237619200.

The previous prime is 42121304221. The next prime is 42121304327. The reversal of 42121304225 is 52240312124.

It is not a de Polignac number, because 42121304225 - 2² = 42121304221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42121304194 and 42121304203.

It is not an unprimeable number, because it can be changed into a prime (42121304221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 816560 + ... + 866609.

It is an arithmetic number, because the mean of its divisors is an integer number (1460991560).

Almost surely, 2^42121304225 is an apocalyptic number.

It is an amenable number.

42121304225 is a deficient number, since it is larger than the sum of its proper divisors (28006290655).

42121304225 is a wasteful number, since it uses less digits than its factorization.

42121304225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683210 (or 1683205 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 42121304225 its reverse (52240312124), we get a palindrome (94361616349).

The spelling of 42121304225 in words is "forty-two billion, one hundred twenty-one million, three hundred four thousand, two hundred twenty-five".