42117322221 has 80 divisors (see below), whose sum is σ = 70209659520. Its totient is φ = 24996366720.

The previous prime is 42117322217. The next prime is 42117322241. The reversal of 42117322221 is 12222371124.

It is a happy number.

42117322221 is a `hidden beast` number, since 4 + 2 + 117 + 322 + 221 = 666.

It is not a de Polignac number, because 42117322221 - 2² = 42117322217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42117322241) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3286336 + ... + 3299126.

It is an arithmetic number, because the mean of its divisors is an integer number (877620744).

Almost surely, 2^42117322221 is an apocalyptic number.

It is an amenable number.

42117322221 is a deficient number, since it is larger than the sum of its proper divisors (28092337299).

42117322221 is a wasteful number, since it uses less digits than its factorization.

42117322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12928 (or 12919 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

Adding to 42117322221 its reverse (12222371124), we get a palindrome (54339693345).

The spelling of 42117322221 in words is "forty-two billion, one hundred seventeen million, three hundred twenty-two thousand, two hundred twenty-one".