42121255505 has 32 divisors (see below), whose sum is σ = 60380204544. Its totient is φ = 27580455936.

The previous prime is 42121255499. The next prime is 42121255511. The reversal of 42121255505 is 50555212124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42121255499) and next prime (42121255511).

It is a cyclic number.

It is not a de Polignac number, because 42121255505 - 2¹⁰ = 42121254481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433247 + ... + 521483.

It is an arithmetic number, because the mean of its divisors is an integer number (1886881392).

Almost surely, 2^42121255505 is an apocalyptic number.

It is an amenable number.

42121255505 is a deficient number, since it is larger than the sum of its proper divisors (18258949039).

42121255505 is a wasteful number, since it uses less digits than its factorization.

42121255505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88865.

The product of its (nonzero) digits is 20000, while the sum is 32.

Adding to 42121255505 its reverse (50555212124), we get a palindrome (92676467629).

The spelling of 42121255505 in words is "forty-two billion, one hundred twenty-one million, two hundred fifty-five thousand, five hundred five".