42505362121 has 4 divisors (see below), whose sum is σ = 42527583252. Its totient is φ = 42483140992.

The previous prime is 42505362113. The next prime is 42505362167. The reversal of 42505362121 is 12126350524.

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 37167598521 + 5337763600 = 192789^2 + 73060^2 .

It is a cyclic number.

It is not a de Polignac number, because 42505362121 - 2³ = 42505362113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42505362101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11107696 + ... + 11111521.

It is an arithmetic number, because the mean of its divisors is an integer number (10631895813).

Almost surely, 2^42505362121 is an apocalyptic number.

It is an amenable number.

42505362121 is a deficient number, since it is larger than the sum of its proper divisors (22221131).

42505362121 is a wasteful number, since it uses less digits than its factorization.

42505362121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22221130.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 42505362121 in words is "forty-two billion, five hundred five million, three hundred sixty-two thousand, one hundred twenty-one".